What are the 3 events in meiosis that contribute to genetic variation ?

Escherichia coli, Staphylococcus, and Clostridium perfringens (E. coli; toxic strain). They undermine health by causing illness and hastening aging. When you are healthy, opportunistic microbes do not present a problem.

They are to blame for a number of infectious ailments, including tooth decay, diphtheria, syphilis, tuberculosis, and pneumonia. Certain bacteria break down cellulose, destroying textiles, wooden things, and canvas.

Bacteria can occasionally grow so quickly that they crowd out host tissues and impair normal function. Sometimes they actually kill tissues and cells. Sometimes they produce poisons that can paralyze, dismantle the metabolic machinery of cells, or trigger an enormous immunological response that is also toxic.

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A decrease in genetic diversity bad because it increases the risk of extinction of a population through inbreeding depression.

This is a result of despair brought on by inbreeding paired with a lack of ability to adjust to change. New alleles can be introduced in these situations to save the population. For a population to adapt to changing circumstances, genetic diversity is essential.

Genetic drift is a result of sampling error because individuals are randomly chosen when a population is sampled. A random selection is one in which each member of the population has an equal chance of being chosen.

The variety of various inherited features within a species is referred to as genetic diversity. There would be many people with a wide range of diverse traits in a species with significant genetic diversity. For a population to adapt to changing surroundings, genetic variety is essential.

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Through genetic engineering, genes from one species can be introduced into another that is unrelated. The individuals involved in selective breeding must be of the same species.

In GMO, researchers combine new gene combinations. Genes come together on their own during selective breeding. By utilizing pollen from one strain to fertilize another strain and therefore "cross" the gene pools, for instance, selective breeding can change a species' genetic makeup naturally.

The chromosomes are altered intentionally through genetic engineering—a technique that is against nature. For instance, a crop may contain a gene from a cold-water fish to prevent freezing during the winter. This wouldn't happen in the wild.

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Answer:

Claim: Trees change the composition of the atmosphere around us.

Evidence: Trees absorb carbon dioxide from the atmosphere through the process of photosynthesis and release oxygen back into the air. This process helps to regulate the concentration of these gases in the atmosphere and can affect the overall composition of the air.

Reasoning: Photosynthesis is a fundamental process that occurs in plants, including trees. During photosynthesis, trees absorb carbon dioxide from the air and use it, along with sunlight and water, to produce energy and grow. As a byproduct of this process, trees release oxygen back into the air. This exchange of gases between trees and the atmosphere helps to regulate the concentration of carbon dioxide and oxygen in the air and can affect the overall composition of the atmosphere. Therefore, it is reasonable to conclude that trees do change the composition of the atmosphere around us.

False. Not all decisions require risk evaluation or mathematical modeling.

Evaluation is the process of examining and assessing a product, system, service, or program to determine its worth and effectiveness. It is a systematic process that involves identifying and measuring objectives, gathering information, analyzing data, and drawing conclusions. Evaluation is important to determine if a program is meeting its intended goals and helping to improve outcomes. Evaluation can also be used to inform decisio-making, identify areas of improvement, and provide feedback on performance. Evaluation helps to ensure that resources are being used effectively and efficiently. It can also provide guidance for future investments, help to set objectives and priorities, and provide evidence-based information for the development of policies and programs.

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Carotenoids are pigments that give leaves their yellow and orange colors. These pigments are always present in leaves, but become more visible as the chlorophyll breaks down in the fall.

Leaves change B due to changes in the pigments that are present in the leaf. Chlorophyll is the pigment primarily responsible for the green color of leaves and is present in all leaves. Chlorophyll is important for the process of photosynthesis, which allows plants to convert light energy into chemical energy. However, as the days get shorter and temperatures cool in the fall, the level of chlorophyll in a leaf decreases and the chlorophyll breaks down. This process causes the green color of leaves to fade, revealing other pigments that have been present in the leaf all along.

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Artificial selection is the identification by humans of desirable traits in plants and animals, and the steps taken to enhance and perpetuate those traits in future generations.

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Sister chromatids are chromosomal chromatids that are identical to one another. They are normally produced by the DNA molecule of a single chromosome replicating in a semi-conservative manner.

They are therefore "photocopies" of the original parent chromosomes that have been joined at the Centromere. They share the same gene and allele makeup, making them completely identical.

There are, however, slight variations between the two identical sisters due to mutation from replication errors and alterations in the length of telomere repeats.

In metaphase I, tetrads arrange themselves along the metaphase plate whereas homologous pairs orient themselves randomly. During anaphase I, homologous chromosomes separate and centromeres deteriorate.

In telophase I, chromosomes move to opposite poles, and in cytokinesis, the cell splits into two haploid cells.

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its a plant dawg think smarter not harder ✊

The additional compounds that seem to be high potential energy molecules for transporting electrons to oxidative phosphorylation during cellular respiration include The majority of ATP molecules created during cellular respiration come from oxidative phosphorylation.

The process through which organisms combine oxygen and food molecules, direct the chemical energy of those components toward life-sustaining processes, and eliminate carbon dioxide and water as waste is known as cellular respiration.

The process of breaking down sugar in the presence of oxygen and releasing energy in the form of ATP is known as cell respiration, and it takes place in the mitochondria of living things (animals and plants). Water and carbon dioxide are emitted as waste during this procedure.

Through the mitochondrial electron transport chain, ATP production is connected to electron transfer and corresponding oxygen consumption through the process of oxidative phosphorylation.

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The ability to live in a highly acidic environment and the ability to withstand very hot temperatures are the adaptations that allow thermophiles, a type of bacteria, to live within the hot springs of Yellowstone National Park.

what is Adaptation?

Adaptation is the physical or behavioural characteristic of an organism that helps an organism to survive better in the surrounding environment.

The main feature of Yellowstone National Park is the presence of very hot and acidic water. Starting as rain on the surface, water from hot springs seeps through the bedrock beneath Yellowstone and is superheated by Yellowstone's magma system.

Thermophilic proteins have several adaptations that give them the ability to maintain structure and function at extreme temperatures. Thermophiles, for example, have specialized enzymes that use additional hydrogen bonds, salt bridges, and disulfide bonds to resist denaturation at very high temperatures, strengthening proteins to resist unfolding increase.

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The exact traits of each bird's beak and the type of environmental alteration will determine how changing the environment will affect how various beaked birds eat.

For instance, birds with long, narrow beaks designed for digging deeply into blossoms or grabbing insects may have a tougher difficulty locating food if the environment gets drier and food sources become limited.

Their population might decrease as a result of this. Similarly to this, birds with short, broad beaks that are evolved to split apart seeds may have a tougher difficulty locating food if the environment becomes wetter and food sources become limited.

On the other hand, if the environment changes in a way that creates new food sources, birds with beaks adapted to exploit those resources may do well. For example, if a new type of berry becomes available, birds with beaks adapted for eating berries may thrive in that environment.

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Answer:

Food, Inc. Summary

If you aren’t completely familiar with what it is, Food, Inc was created by documentary filmmaker Robert Kenner and narrated by Eric Schlosser (Fast Food Nation), and also features commentary from Michael Pollan (The Omnivore’s Dilemma).

It lifts the veil on how the nation’s food industry has been consumed by corporations and how that impacts the farms where our food comes from, the supermarkets where we buy our food, and the restaurants where we eat that food. It tackles the FDA, food safety, food production, large-scale animal processing plants, and other food matters. If you are at all concerned or curious about the state of food supply in America, you should watch Food, Inc.

The Key Takeaways from the Movie

Supermarkets and Corn

The tomatoes you buy in the grocery store are picked when green and then ripened with ethylene gas

The food industry doesn’t want you to know the truth about what you are eating because if you did you might not eat it—it is a world deliberately hidden from us

Most people have no idea where their food comes from (do you?)

The fact that people need to write a book (and a blog!) telling people where their food comes from shows how far removed we are

The average grocery store has 47,000 products which makes it look like there is a large variety of choices—but it is an illusion—there are only a handful of corporations (like Monsanto, Tyson, and Perdue for example) and a few major crops involved

So much of the processed food is just clever rearrangements of corn (here are just a few examples of the additives that are derived from corn: cellulose, saccharin, polydextrose, xanthan gum, maltodextrin, and my favorite—ha ha ha—high fructose corn syrup)

30% of our land base in the US is used to grow corn because thanks to government policy farmers are paid to overproduce this easy-to-store crop

Farmers are producing so much corn that food scientists had to come up with uses for it—just like some of the additives listed above

Food scientists have also spent a lot of time reengineering our foods—so they last longer on grocery store shelves and don’t get stale

At the supermarket, candy, chips, and soda are all cheaper than produce

A double-cheeseburger from McDonald’s is 99 cents and you can’t even get a head of broccoli for that price

Those snack calories are cheaper because the commodity crops like corn, wheat, and soybeans are heavily subsidized

You start feeding corn to cows, E. Coli evolves and a certain mutation occurs which is very a harmful bacteria

Animals at factory farms stand ankle deep in their manure all day long so if one cow has E. Coli others can get it too

At a slaughterhouse their hides are caked with manure and if you are slaughtering 400 cows per hour how do you keep it from spreading?

So these harmful new strains of e Coli, that didn’t use to be in the world, are now a problem

E. Coli is even in spinach and apple juice because of the runoff from factory farms

It doesn’t help that the Chief of Staff for the USDA was a former lobbyist for the beef industry

Regulatory agencies are being controlled by the very companies they are supposed to be scrutinizing

There has always been food poisoning, but food is not getting safer it is becoming more contaminated because with the bigger factories it spreads the problem far and wide

There are only 13 slaughterhouses for the majority of beef in all the US

Ground beef from the grocery store has thousands of different cows mixed up in it so the chance of one of those cows in your meat having a disease is increased

After eating hamburger contaminated with E. Coli 0157:H7 a woman’s 2-year-old son went from a perfectly healthy boy to being dead in 12 days

In the 90’s some industrial meat factories were tested for E. Coli 0157:H7 and if they failed they were supposed to be shut down—but there was not enough authority to close the contaminated plants

Some companies are now using a hamburger meat filler cleansed with ammonia hydroxide to help kill E. Coli (mmm…that sounds tasty)

The process by which the root hairs release CO2 into the soil is respiration. The correct option is Option C.

There are air pockets present between the soil particles where the oxygen required by the root of the plant is trapped. Root hair exchanges gasses to and from tiny air pockets present in between the soil particles.

The large surface area provided by root hairs facilitates this exchange of gasses along with the absorption of water.

Hence, root hair carries out the exchange of oxygen and carbon dioxide to and from tiny air pockets present in between soil particles.

The CO2 released from the root hair into the soil particles is the byproduct of respiration.

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A possible claim based on the information provided could be:

The statement describes an experiment or observation that compared the count of normal liver cells to that of cancerous cells at different cell densities. The results showed that the count of normal liver cells remained relatively stable as the cell density increased, while the count of cancer cells increased at higher cell densities.

From this observation, the conclusion was drawn that cancer cells in the liver have lost the harmony and coherence that is typical of healthy tissue.

Therefore, this claim is based on the experiment/observation conducted and the comparison of the count of normal liver cells and cancer cells. It implies that cancer cells are behaving differently from normal cells in a way that makes them less orderly and more chaotic and thus different from healthy tissue.

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See full question below

Count of normal liver cells vs. cancerous cells.

Normal liver cells (lower curve) have a relatively stable count

at increasing cell density, while cancer cells of the same cell

type show an increased count at higher cell densities. From

this, it was concluded that populations of cancer cells have

lost the harmony and coherence that is typical for healthy

tissue. What claim can be obtained from the above statement.

The respiratory system allows for passive transport for gas exchange as the body receives oxygen from the outside air; Additionally, waste gases such as carbon dioxide and water vapor are released outside the body into the air.

Respiration: The life-sustaining process in which gases are exchanged between the body and the surrounding atmosphere is known as gas exchange. More specifically, oxygen enters the body from the outside air; and waste gases like carbon dioxide and water vapor are released into the air outside the body. The respiratory system is primarily responsible for respiration. The exchange of gas is the other process. This is the biochemical process by which carbon dioxide and other waste gases diffuse from the blood into the air and oxygen diffuses from the air into the blood.

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Mendel's pea plants gave us a clear and straightforward framework for analyzing the inheritance of traits, which improved our understanding of genetics. Pea plants are a good choice for Mendel's research because they can easily self- or cross-fertilize and have a short generation time.

Mendel exploited the distinct and readily observable traits of pea plants in his tests, including seed color, seed shape, and bloom color.

According to Mendel's research, traits are influenced by specific "factors" that are passed from parent to child. He discovered that the presence of two alleles, one inherited from each parent, determines the inheritance of each feature and that one allele can be dominant over the other.

He also discovered that different characteristics are inherited independently of one another and that the probability of an offspring inheriting a specific allele from a parent is 50%. These discoveries laid the foundation for the field of genetics and provided a framework for understanding how traits are passed down from one generation to the next.

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Answer:

D cause not all stages of meiosis follow DNA replication.

Mendel concluded that traits can be divided into overt and latent traits. He named these dominant and recessive traits respectively. Dominant traits are traits that are inherited unchanged by hybridization.

Mendel developed his three principles of heredity to explain the transmission of hereditary traits before anyone knew that genes existed. Mendel's laws of inheritance​ greatly expanded our understanding of heredity and led to the development of new experimental methods.

Mendel's conclusion:

Genetic determinants are unique in nature. These determinants are called genes. Each parent has a pair of genes in each cell for each trait tested. F1 from a cross between two pure strains contains one allele with a dominant phenotype and one allele with a recessive phenotype.

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In given pedigrees II-1 heterozygous because the man (II-1) that brown-eyed woman marry has brown eye but they have a son (III-1) with blue eye. So, genotype of II-1 will be Bb.

A family tree diagram that makes use of standardized symbols. The relationships between family members are shown in a pedigree, which also identifies the members of a family who have particular genetic pathogenic variants, traits, and diseases as well as their current health.

Pedigrees are typically employed to illustrate straightforward dominant and recessive traits. Having a widow's peak hairline, for instance, is dominant. If someone possesses that quality, their pedigree symbol will be shaded in.

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Much of the world's sulfur is found in sea water, the atmosphere, eggs, cabbage, volcanic glass, coral reefs, gypsum, pyrite, and computer chips.

Sulfur is a versatile and abundant element that can be found in a variety of sources. In the sea, sulfur is found in its elemental form, usually bound to other elements such as oxygen and hydrogen.

In the atmosphere, sulfur is found mainly as sulfur dioxide, a byproduct of combustion.

Eggs, cabbage, and volcanic glass contain sulfur in the form of sulfates. Coral reefs are composed of calcium sulfate, and gypsum is largely composed of calcium sulfate dihydrate.

Pyrite is an iron sulfide mineral that is found in many rocks. Finally, sulfur is also present in computer chips, where it is used in the form of transistors to control the flow of electrons. All of these different forms of sulfur are essential for life on earth, and many of them are used in industry and technology.

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The two main types of mutations are, 1.Gametes include germline alterations. 2. Somatic mutations happen in the body's other cells.

These mutations are particularly important since they can be passed down to kids, who will all have the mutation in every cell environmental elements and utterly arbitrary causes Mutations can also be brought on by outside factors like specific chemicals or extreme radiation. Let's learn about many mutations and their sorts now that we are familiar with the definition of mutation and its causes.

Based on the base pair substitution, there are two types of point mutation. It is a point mutation that results from the replacement of one purine or one pyrimidine with another. It is a point mutation that happens when pyrimidine is substituted for purine and vice versa. There are three types of point mutations based on transcriptional characteristics.

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A plant having the genotype AABbCC will produce solely ABC and AbC gametes. The 2n formula is used to compute the phenotypes in the cross, whereas the 3n formula is used to calculate the genotypes in the cross.

A cross between the AABBCC and the aabbcc genotypes results in an F1 hybrid with the AaBbCc genotype. An organism produces 2n kinds of gametes,

where n is the number of heterozygous genes present. Because the hybrid AaBbCc is heterozygous for three genes, its total number of potential gametes is 23=8.

The F1 generation plants have the genotype AABbCC. 2n where n= 1 may be used to calculate the number of gametes involved in a specific cross ( n is the number of heterozygotes). As a result, there will be two gametes, ABC and AbC. The phenotype of the F2 generation after selfing these plants will be 3:1, as depicted in the Punnett square.

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Natural selection consists of four components: variation, inheritance, rapid population growth, and differential survival and reproduction.

Natural selection is the process by which organisms with advantageous changes survive and reproduce more frequently. Adaptation is an inherited variation that increases an organism's chances of survival.

Individuals in a population are naturally variable, which means they differ in some ways. This variation indicates that some people have traits that are better suited to their environment than others.

Evolution refers to the gradual changes that occur in organisms over time that result in the formation of more complex forms. The study of the history of the evolution of newer forms of life on Earth from pre-existing forms over time is known as evolutionary biology.

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Perhaps the strongest fossil evidence for evolution is the continuity of the fossil record from prehistoric to modern times.

The Devonian, the age of the fishes, or human fossils amid dinosaur remains are not things we discover anyplace on Earth. The five assumptions that Darwin combined are evolution, or common descent, gradualism, species diversity, and natural selection. A theory is a reason for how a natural phenomena works that has been put to the test extensively through observations and tests meant to prove the correctness of the explanation. In this situation, evolution may be viewed as a theory as well as reality. It cannot be disputed that throughout Earth's history, living things have changed or evolved.

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Nutrients and ions can pass directly from cell to cell through special membrane junctions known as gap junctions.

Gap junctions are structures composed of transmembrane proteins that enable communication between cells. They are found in most animal cells and play a critical role in the coordination of cellular activities.

Gap junctions are important for maintaining homeostasis in the body. They allow for an exchange of ions, metabolites, and other molecules between cells. This process helps to maintain a balance of nutrients and ions throughout the body. Gap junctions are also involved in the coordination of cellular activities such as cell growth, differentiation, and cell migration.

Gap junctions are composed of two connexons, or hemichannels. The connexons are composed of six transmembrane proteins, referred to as connexins. The connexins form a channel between the two cells, allowing for the exchange of small molecules and ions. The connexons can open and close in response to a variety of external and internal signals, allowing for a tightly regulated exchange of materials.

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The enzyme that can proof-read the DNA molecule during the process of DNA replication is called DNA polymerase. DNA polymerase is responsible for adding nucleotides to the growing strand of DNA during replication.

Some DNA polymerases, such as DNA polymerase III and DNA polymerase I, have a proofreading exonuclease activity that allows them to remove any nucleotides that are not correctly paired with the template strand during replication.

The proofreading exonuclease activity of DNA polymerase works by recognizing mismatches between the nucleotides that have been added to the growing strand and the template strand. When a mismatch is detected, the exonuclease activity of the enzyme removes the incorrectly paired nucleotide, allowing the polymerase to add the correct nucleotide in its place.

This proofreading activity increases the accuracy of DNA replication, reducing the number of errors made during replication to approximately 1 in 10^5 nucleotides.

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