The four major principles of natural selection are that populations of living things change over time due to a straightforward mechanism called natural selection.
In fact, it is so straightforward that it can be divided into five simple processes, referred to here as VISTA (variation, inheritance, selection, time, and adaptation). Most attributes are inherited, more offspring are generated than can survive, and offspring with more attractive traits will survive and have more offspring than those with less favorable traits.
These three principles result in natural selection, which is an unavoidable process. More environment-adapted organisms are more likely to survive and pass on the genes that contributed to their success. Over time, species change and diverge as a result of this process.
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If a grain of the average apple tree pollen has 17 chromosomes and is used to pollinate an ovule, then the resulting apple seed will contain
Apple seeds produced from pollen have 17 chromosomes, so these seeds will contain 34 chromosomes.
Seeds are embryonic plants that are covered with a protective coating on the outside. Seed formation is part of the reproductive process in seed plants, namely spermatophytes.
Inside the seed, there is an embryo formed from the meeting between the male gamete (stamen) and the female gamete (pollen). The embryo has its position inside the seed, precisely at the core of the seed, and is surrounded by existing food reserves.
Because the seeds come from the meeting of 2 gametes, the number of chromosomes is 34, half of the male parent and half of the female parent.
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How nutritional information from food labels is used to identify if each of the products is high low or neither in terms of fat sugar and salt content?
Explanation:
Food labels always state the sugar, fat and salt content in percentage or per 100 grams or per serving to help consumers in their selection of products.
What phenomenon leads to calico pigmentation in female cats?
In cats, the genes for coat pigmentation are X-linked, resulting in an orange or black coat color depending on which copy of the X chromosome each cell has activated. X inactivation occurs only in cells with multiple X chromosomes. This characterize why almost all calico cats are female.
Known for their distinctive black, orange, and white coat patches, the calico cat is an example of a genetic process known as "lionization." Because calico cats have a genetic condition called spotting. Mottled animals have white skin or patches of white fur. This is controlled by genes that affect the ability of skin cells to produce the pigments responsible for color.
The X chromosome determines a cat's color, and female cats, like all female mammals, have two X chromosomes, but male mammals, including the common male cat, have an X chromosome and a Y chromosome.
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Cystic fibrosis is a recessively inherited disorder that results from a mutation in the gene encoding CFTR chloride ion channels located on the surface of many epithelial cells. As shown in the figure, the mutation prevents the normal movement of chloride ions from the cytosol of the cell to the extracellular fluid. As a consequence of the mutation, the mucus layer that is normally present on the surface of the cells becomes exceptionally dehydrated and viscous.
An answer to which of the following questions would provide the most information about the association between the CFTR mutation and the viscous mucus?
answer choices
Is the mucus also secreted from the cells through the CFTR proteins?
How does the disrupted chloride movement affect the movement of sodium ions and water by the cell?
How does the mutation alter the structure of the CFTR proteins?
What is the change in nucleotide sequence that results in the CFTR mutation?
The question that would provide more information about the relationship between the CFTR mutation and the viscous mucus, is:
How does the disrupted chloride movement affect the movement of sodium ions and water by the cell?Correct answer: letter B.
This question is the right question to ask because the CFTR mutation disrupts the chloride movement, which in turn affects the movement of sodium ions and water by the cell.
This could be the cause of the abnormally viscous mucus layer, and the answer to this question would provide more information about the association between the CFTR mutation and the viscous mucus.
Regarding the question, Disruption of chloride movement affects the movement of sodium ions and water through the cell because it alters the osmotic balance between the cell and its environment. Normally, the flow of chloride ions out of the cell is coupled to the flow of sodium ions into the cell.
This creates an osmotic gradient that attracts water into the cell. When the flow of chloride ions is interrupted, this gradient is also interrupted, resulting in decreased movement of sodium ions and water into the cell. The result is dehydration and the formation of a viscous layer of mucus on the cell surface.
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simple sugars, like glucose, can be combined to make more complex larger sugar molecules like fructose and complex carbohydrates
true or false
Answer: true
Explanation:
Which of the following helps determine past climate on the basis of tree rings?
O oxygen isotope analysis
O pollen analysis
O dendrochronology
O 18O/16O ratio
O all of the above
If the year dates of the tree growth rings can be identified, the scientific discipline of dendrochronology can indeed be utilised to establish when a tree was cut down or died naturally. Seasonal climate shifts affect a tree's annual growth, which varies throughout the year.
Dendrochronology's goal is what?The study known as dendrochronology, sometimes known as tree-ring dating, uses the annual growth rings that trees create to determine dates on a calendar (Nash 2000). This precise and sophisticated dating technique has been employed by archaeologists for nearly a century.
What dendrochronology principles are there?According to this theory, there must have been physical and biological mechanisms in place in the past that connect present environmental processes with the patterns of tree development that exist today. James Hutton first said this in 1785, and it is now often understood to mean "the current is the keys to the past."
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What organelle is the colored green and located on the outside of the plant cell?
The organelles that are unique to plant cells are the chloroplast, cell wall, plastids, and a large central vacuole. The chloroplasts, which contain the chlorophyll pigment, are what initiate photosynthesis.
Chlorophyll, the green pigment necessary for photosynthesis and giving plants their green hues, is found in chloroplasts. The carotenoid pigments found in chromoplasts give plants their numerous red, orange, and yellow hues.
Even though a cell wall is not an organelle, it is a significant and distinctive structure in plant cells, thus we have included it here. In both plants and fungi, vacuoles are prevalent and serve a variety of purposes. They are membrane sacs with a structure that is comparable to vesicles, and these two words are sometimes used interchangeably.
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You’ve learned about the laws of thermodynamics. using examples, explain why the first and second laws are significant for living organisms.
The first law of thermodynamics in living things. The sun provides the energy for photosynthesis. Plant leaves have cells that take in light energy and transform it into chemical energy.
The second law states that when everything goes from order to disorder, entropy increases. Living organisms die when there is a systemic imbalance.
Glucose, which is needed to create the complex carbohydrates required to increase plant bulk, serves as a reservoir for the chemical energy.
The second law of thermodynamics has two statements: Clausius's claim A system that operates in a cycle and transfers heat from a low-temperature reservoir (or object) to a high-temperature reservoir (or object) without causing any outside influences or interacting with the environment is not conceivable to build.
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Group the items according to the type of respiration they describe.
The items:
Carbon dioxide by-product
Produces ATP
Uses oxygen
Fermentation
Takes place within cells
Does not use oxygen
Type of respiration:
Aerobic
Both
Anaerobic
Aerobic Process: Oxygen, Carbon Dioxide by-product
Anaerobic Process: Carbon Dioxide, Fermentation
Both: Produces ATP, Takes place in cells
What is Respiration and Types of Respiration?All organisms go through the metabolic process of breathing. It is a biological process that takes place inside of an organism's cells. The breakdown of glucose in this process results in the production of energy (ATP-Adenosine triphosphate), which is then utilised by cells to carry out numerous tasks. Respiration is a function of all living things, from simple single-celled creatures to dominant multicellular ones.
Let's take a closer look at the various types of respiration that organisms engage in.
Aerobic Respiration
It is a sort of energy-producing cellular respiration that occurs when there is oxygen present. Within the cells of both animals and plants, it is an ongoing process. The chemical equation can be used to describe this process:
Oxygen (6O2) + Glucose (6H12O6) + Carbon dioxide (6CO2) + Water (6H2O) + Energy (ATP)
Aerobic respiration takes place When there is oxygen.Aerobic respiration generates carbon dioxide and water as waste productsAerobic respiration generates more energyAnaerobic Respiration
In the absence of oxygen, it is a sort of cellular respiration that generates energy. Anaerobic respiration's chemical formula is
Alcohol 2(C2H5OH) + Carbon dioxide 2(CO2) + Energy = Glucose (C6H12O6) (ATP )
Anaerobic respiration does not takes place,whwn there is oxygen is present Anaerobic respiration generates alcohol, Anaerobic respiration generates less energy
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An enzyme called tyroinae produced the dark compound in kin (melanin). I’m albinim, thi enzyme doe not work or i not preent. Explain how each mutation could be reponible for Albinim
The majority of TYR mutations render tyrosinase inactive, preventing melanocytes from ever generating melanin. Type 1A oculocutaneous albinism is a result of several mutations (OCA1A).
The term "albinism" typically refers to oculocutaneous albinism, a group of genetic illnesses wherein the body produces little to no melanin. Your skin, hair, and eye colors are all influenced by the type and quantity of melanin in your body. Because melanin is involved in the growth and operation of the eyes as well, albinos have vision issues.
Albinism symptoms are typically visible in a person's skin, hair, and eye color, however sometimes there are minute variations. Due to their sensitivity to the sun's effects, people with albinism are more likely to get skin cancer.
Albinism has no known treatment, but those who have the condition can take precautions to protect their skin.
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Which type of wave is used in sonar to detect objects?(1 point)
Answer: sound waves
Explanation:
In your own words, describe what happens when a flat sign is put in front of a pitch and how the sound is affected.
Answer:
When a flat is put in front of a pitch it raises the pitch of the original note by a half step, a flat lowers the pitch of a note by one half step.
Explanation:
Scientific studies have proved that properly placed dental sealants are _____ effective in protecting development of cavities in sealed tooth surfaces.
Scientific studies have proved that properly placed dental sealants are highly effective in protecting the development of cavities in sealed tooth surfaces.
A dental sealant is a thin plastic coating that is applied to the chewing surface of molars, premolars, and any deep grooves (called pits and fissures) of teeth. The sealant acts as a barrier, protecting the teeth from decay-causing bacteria.
The process of applying dental sealants is simple and painless. The tooth surface is first cleaned, and then the sealant is applied. The sealant hardens and bonds directly to the enamel of the tooth, creating a protective shield. This shield acts like a wall, preventing tooth decay-causing bacteria from entering the deep grooves of the teeth.
Studies have shown that dental sealants reduce the risk of cavities by 82 percent in sealed tooth surfaces. This is due to the fact that the sealant prevents bacteria from entering the deep grooves of the teeth and attacking the enamel. The sealant also helps prevent food particles from becoming trapped in the grooves, which further reduces the risk of tooth decay.
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What is the summary of Mendel's principles?
Gregor Mendel discovered the basic laws of heredity through the study of peas. He concluded that genes come in pairs and are inherited as separate entities, one from each parent. Mendel traced the segregation of parental genes and their appearance in offspring as dominant or recessive traits.
Mendel's four postulates and laws of heredity are: (1) the principle of pair factor, (2) the principle of dominance, (3) the law of germline segregation or purity (Mendel's first law of inheritance) and (4) the law of independent selection (Mendel's second law of inheritance).
Mendel generalized the results of his pea experiment into his three principles that explain the genetic basis of diploid organisms. they are: the principle of segregation, the principle of dominance, and the principle of independent assortment.
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Is this correct? and can you explain why its not incorrect or correct?
Answer:
Yes,Good Bro no it's a joke you re bad
A farm worker accidentally was splashed with a powerful insecticide. A few minutes later he went into convulsions, stopped breathing, and died. The insecticide acted as a competitive inhibitor of an enzyme important in the function of the nervous system. Describe the structural relationship between the enzyme, its substrate, and the insecticide molecule.
The enzyme is made up of a protein structure and binds to its substrate, which is often a specific molecule that is necessary for the enzyme’s function. The insecticide molecule is similar in structure to the substrate, but is much more powerful.
The insecticide molecule is a competitive inhibitor, meaning that it binds to the same site on the enzyme as the substrate does, preventing the substrate from binding to the enzyme and, in turn, preventing the enzyme from catalyzing its reaction.
The structure of the enzyme-substrate complex and the insecticide-enzyme complex are similar, with the insecticide molecule fitting into the active site of the enzyme, forming a strong bond with the enzyme and preventing the substrate from binding to its active site. The insecticide molecule has a higher affinity for the enzyme than the substrate, which is why it is able to block the enzyme from catalyzing its reaction and, ultimately, cause the death of the farm worker.
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A fixed pattern of long and short notes that is repeated or varied is known as a. a cantus firmus. b. a rhythmic mode. c. a melisma. d. organum.
A cantus firmus (Latin for "fixed song") is a pre-existing melody used as the basis of a new composition. So option a is correct.
It is most commonly found in the form of a long and slow-moving melody, which is then repeated or varied by the composer. The cantus firmus was a popular form of composition in the Middle Ages and Renaissance eras, used by composers such as Josquin des Prez, Palestrina, and Orlando di Lasso.
A rhythmic mode is a pre-existing pattern of strong and weak beats used as the basis of a new composition. It is a more varied form of composition than the cantus firmus, as it contains not only long and slow-moving notes, but also fast and light notes. The rhythmic mode is found in music from many different cultures, such as African, Indian, and Latin American. Composers such as Bach, Beethoven, and Mozart used rhythmic modes in their compositions.
A melisma is a type of vocal ornamentation in which several notes are sung on the same syllable. It is a popular form of singing in many musical styles, including jazz, gospel, and classical. Melismatic singing is often used to express emotion or add color to a song. Composers such as Handel and Vivaldi used melismatic singing in their compositions.
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The female reproductive system produces a reproductive cell called a(n) . These cells are produced in the ovaries. Then they travel to a(n) and finally to the uterus.
The female reproductive system produces a reproductive cell called egg . These cells are produced in the ovaries. Then they travel to fallopian tube and finally to the uterus.
What is the female reproductive system?
The outer part of the female genitalia is called the vulva, which means covering. The vulva is located between the legs and covers the opening to the vagina and other reproductive organs of the body.
Female reproductive organs are the vagina, uterus, fallopian tubes, and ovaries. A female reproductive system enables a woman to:
produce egg cells (eggs)have intercourseprotect and nourish fertilized eggs until they are fully developedgive birth HerOvaries have her two main reproductive functions in the body. They produce oocytes (eggs) for fertilization and produce the reproductive hormones estrogen, progesterone, and androgens.
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Later, heat rising from below causes part of the metamorphic rock to melt, forming magma. what is it?
Metamorphism occurs when the heat rising from below causes the part of the metamorphic rock to melt, forming magma.
What is metamorphic rock?Metamorphic rocks are formed from other rocks which substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks are formed when the rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, the combination of these factors.
Metamorphism occurs when the solid rock undergo changes in the composition and texture without mineral crystals undergoing melting, which is how the igneous rock is generated.
If there is too much heat or pressure applied, the rock will melt and become magma. This will result in the formation of an igneous rock, and not a metamorphic rock.
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Neurons have two ends. Nerve impulses travel from the end of one neuron to the beginning of another. What terms are used for these ends?
The place where the one ending of the neuron that is the axon of one neuron meets the dendrite of another neuron is called a synapse. Synapses are also found between the neurons and other types of cells, such as muscle cells in the body.
What is Synapse?Neurons are the fundamental units of the brain and nervous system in the higher vertebrates, the cells which are responsible for receiving sensory input from the external world, for sending motor commands to the muscles, and for transforming and relaying the electrical signals at every step.
The synapse is the small pocket of space between two nerve cells, where they can pass messages or signals to communicate. A single neuron may contain thousands of synapses within it. In fact, one type of neuron called the Purkinje cell, found in the brain's cerebellum, may have as many as about one hundred thousand synapses.
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HIV is a retrovirus. How are retroviruses unique from other types of viruses? a. They can enter any type of body cell. b. They contain single-stranded RNA inside the capsid. c. They use the host cell RNA polymerase for transcription. d. They use reverse transcriptase to make DNA from RNA.
Answer:
d. They use reverse transcriptase to make DNA from RNA
An alpine area of a national park near a trail is normally covered by plants, but much of the area is now bare soil. Park rangers suspect that trampling by hikers has killed the plants. Which of the following will best test the hypothesis?
Pilihan jawaban
Counting the number of hikers leaving the trail in comparison with the number of hikers leaving other trails
Counting the number of plants along the trail in comparison with the number of plants along other trails
Comparing the number of hikers this year to the number of hikers last year on various trails
Comparing plant survivorship in areas where hikers stay on the trail with plant survivorship in the area where hikers leave the trail
Comparing the ages, heights, and weights of hikers on different trails
Comparing plant survivorship in areas where hikers stay on the trail with plant survivorship in the area where hikers leave the trail is the best test of the hypothesis.
In the western Himalayas, the threshold over which trees can no longer be found varies according to height, aspect, slope, and other factors, but is often above 3600m. This is one of the most critical zones for creatures that live at high altitudes. The Kosciuszko National Park is bordered by the Alpine National Park, which spans from middle Gippsland to the New South Wales border. Some of Australia's most beautiful alpine scenery, including mountain peaks, escarpments, and grassy high plains, may be found within the park.
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differentiate between primary pulmonary cancers and secondary lung cancers?
Primary lung cancer is a type of cancer that starts in the lungs. Secondary lung cancer is cancer that spreads from another part of the body to the lungs. Primary lung cancer is the topic of this page. Primary lung cancer comes in two main types.
These are categorized according to the kind of cells in which the cancer first appears. These are: Non-small-cell lung cancer is the most prevalent type, affecting between [tex]80[/tex] and [tex]85[/tex] of every [tex]100[/tex] cases. There are three possible varieties: adenocarcinoma, squamous cell carcinoma, or large-cell carcinoma. Lung cancer with small cells is less common and typically spreads more quickly than non-small-cell lung cancer.
The recommended treatments are determined by the type of lung cancer you have. Older people are more likely to get lung cancer. It rarely happens to people under [tex]40[/tex]. In the UK, over [tex]4[/tex] out of [tex]10[/tex] people diagnosed with lung cancer are over [tex]75[/tex].
Lung cancer can occur in people who have never smoked, but smoking is the leading cause, accounting for more than [tex]70%[/tex][tex]%[/tex] percentage of all cases. This is due to the fact that smoking regularly results in the inhalation of numerous toxic substances.
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how does your adrenal gland and pineal gland help you maintain homeostasis?
The adrenal gland helps to maintain homeostasis by producing hormones that regulate metabolism, stress response, and other bodily processes.
What exactly is homeostasis?
Homeostasis is the ability of a living organism or system to regulate its internal environment to maintain a stable equilibrium, such as temperature or pH, despite changes in external conditions. It is a crucial factor in allowing organisms to function normally in their environment.
The pineal gland helps to maintain homeostasis by secreting melatonin which helps to regulate the body’s circadian rhythm and helps to regulate sleep and wake cycles. Together, these two glands help to keep the body in a balanced, homeostatic state.
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What can you put on an apple slice to keep it from turning brown
Everything about this like
Hypothesis
Independent Variable
Dependent variable
Answer:
lemon juice
Explanation:
Acids prevent browning because they react with the oxygen that comes into contact with the surface of the sample. Once all the acid (or whatever else is covering the surface) has reacted with the oxygen or the acid has degraded or washed off, then the sample will start to brown again. Stronger acids, like lemon juice, can even denature the enzyme. This means that the enzyme can no longer perform its original function because of its environment.
The Grand Canyon has much more than pretty scenery. It contains an amazing diversity of rock formations with an abundance of fossils hidden within. These fossils provide clues about past environments. The sedimentary rocks exposed throughout the canyon are rich in fossils, including fossils of these marine (ocean) brachiopod shells.
QUESTION: How does fossil evidence help you explain how the Grand Canyon formed? Write your answer
The most frequent fossils are small sea animals like gastropods, brachiopods, coral, and crinoids. When mixed with sandstone, this suggests that the region was a warmer, shallow sea at the time these sediments were created. The hyphae of rocks is a result of flooding.
What are bryozoans?Little aquatic invertebrates called bryozoans dwell in colonies. Colonies of many species form exterior protective structures called exoskeletons that mimic coral prosthetic limbs. Most colonies are anchored to a structure, such as a rock or sunken branch.
How do fossils work?Any surviving indication of a once-living thing from a previous geological age is known as a fossil. Examples include exoskeletons, bones, shells, animal or microbe imprints in stone, things preserved in glass, locks, fossil pine, and DNA traces. The fossil record is a collection of all fossils.
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How do relationships among organisms help ecosystems thrive? Provide at least 6 sentences.
Relationships among organisms play a vital role in maintaining the balance and stability of ecosystems. These relationships can be categorized into three main types: mutualism, commensalism, and competition.
In mutualism, both species involved in the relationship benefit. For example, many plants have mutualistic relationships with pollinators, such as bees. The plants provide nectar as a food source for the bees, while the bees help to pollinate the plants, allowing them to reproduce.
In commensalism, one species benefits from the relationship while the other is neither helped nor harmed. The relationship between cattle and cattle egrets is an example of commensalism. The egrets feed on insects stirred up by the cattle as they graze, while the cattle are not affected by the presence of the egrets.
In competition, two or more species compete for the same limited resource. This can lead to the evolution of unique adaptations that allow a species to better exploit a particular resource, which in turn can lead to greater biodiversity in an ecosystem.
Predator-prey relationships also play an important role in ecosystems by controlling population sizes and helping to maintain balance within the ecosystem. In addition, decomposers break down dead organic matter and recycle nutrients, making them available for other organisms to use.
In summary, relationships among organisms in an ecosystem are vital for maintaining balance and stability, and ultimately ensuring the survival of the ecosystem.
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The cap that is added to the RNA during processing: (Select all that apply.) O is needed for ribosomes to attach to messenger RNA. O helps prevent rapid breakdown of the messenger RNA. O helps prevent formation of complex three-dimensional structures in the messenger RNA. O aids in the accuracy of translation of the messenger RNA into protein. 4.
The cap that is added to the RNA during processing is an important component in the protein synthesis process. During transcription, this cap, known as the 7-methylguanosine cap, is added to the 5' end of the RNA molecule.
The addition of this cap serves several important functions in the messenger RNA's life cycle messenger RNA (mRNA). To begin with, the cap is required for ribosomes to attach to the mRNA. The cap structure acts as a binding site for ribosomes, which are the cellular organelles in charge of reading mRNA and translating it into protein.
The ribosome recognises the cap structure and uses it as a marker to indicate where translation should begin. Second, the cap prevents the mRNA from being rapidly degraded. mRNAs are constantly attacked by enzymes known as ribonucleases (RNases), which are enzymes that degrade RNA. The cap structure protects mRNA from RNases by making it less accessible to enzymes.
Third, the cap helps to prevent the formation of complex three-dimensional structures in mRNA. The cap structure acts as a marker to indicate where translation should begin, preventing the mRNA from forming complex structures that would obstruct translation.
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Some traits follow non-Mendelian patterns of inheritance. Which is the best term for these patterns based on the reading?
Some traits follow non-Mendelian patterns of inheritance, polygenic traits is the best term for these patterns based on the reading.
The non-Mendelian inheritance pattern is known as what?They are referred to as polygenic traits. The phenotype is slightly amplified by the alleles of each gene. Particularly if each gene has multiple alleles, there are numerous allele combinations that could exist. As a result, a vast spectrum of phenotypes is possible. Adult height is an illustration of a polygenic trait in humans.
Any trait that has a gradient, such as height, skin tone, hair color, nose size, or shape, is non-Mendelian, polygenetic, and influenced by numerous alleles. Another instance of a polygenetic trait that is not Mendelian is eye color.
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The first step in the process of gene expression is transcription. What is the product of transcription during gene expression? A. a codon B. a molecule of thymine C. an RNA polymerase D. a molecule of RNA
Answer:
D
Explanation:
Transcription = DNA to RNA
Translation = RNA to codons to create amino acids or proteins.