Eye color in a particular strain of fly is influenced by one gene with two alleles: a dominant allele that results in red eyes and a recessive allele that results in sepia eyes. A red-eyed female from a true-breeding population is mated with a sepia-eyed male. The Fl offspring are all red-eyed. The Fl flies are allowed to interbreed, producing the following in the F2 generation.
Females: 40 red eyes; 13 sepia eyes
Males: 39 red eyes; 11 sepia eyes
Which of the following best describes the likely mode of inheritance for the eye-color gene?
a. The eye-color gene is likely autosomal because males and females have similar phenotype ratios.
b. The eye-color gene is likely autosomal because more females have sepia eyes than males do.
c. The eye-color gene is likely sex-linked because the males and females have similar phenotype ratios.
d. The eye-color gene is likely sex-linked because the males and females display both phenotypes.

Answer:

The correct option is a. The eye-color gene is likely autosomal because males and females have similar phenotype ratios.

Explanation:

Available data:

              Males: 39 red eyes; 11 sepia eyes

77% of the total progeny has red eyes and 23% has sepia eyes.

Among females, 75% is red-eyed, and 25% is sepia-eyed

Among males, 78% is red-eyed, and 22% is sepia-eyed.

The general phenotypic ratio is 3:1

If the eye-color gene was sex-linked, the phenotypic ratios would be different. There would be a higher proportion of red-eyed females than red-eyed males. Females would only express red eyes, while males would express red and sepia eyes. This is

Cross:         X⁺X⁻   x    X⁺Y        (Note: The symbol + represents the allele R

Phenotype: red-eyed both                    and the symbol  - the allele r)                  

Gametes) X⁺       X⁻     X⁺    Y

Punnett square)    X⁺         X⁻

                      X⁺   X⁺X⁺     X⁺X⁻

                       Y    X⁺Y       X⁻Y

F2) 3/4 of the whole progeny would be red-eyed

     1/4 of the whole progeny would be sepia-eyed

  BUT

     Females: 100% red-eyed

     Males: 50% red-eyed and 50% sepia-eyed

These proportions are not coincident with the exposed real proportions

So,

c. The eye-color gene is likely sex-linked because the males and females have similar phenotype ratios.

If this gene was sex-linked, Males and females would not have similar phenotype ratios. This is FALSE.

d. The eye-color gene is likely sex-linked because the males and females display both phenotypes.

If this gene was sex-linked, Males would display both phenotypes, but females would only be red-eyed. This is also FALSE.

According to this, we can assume that this is an autosomal gene. If this is true, then

Cross:   Rr XX    x    Rr XY

Gametes) RX, RX, rX, rX

                RX, RY, rX, rY

Punnett square:

              RX       RX       rX       rX

RX      RRXX    RRXX   RrXX   RrXX

rX       RrXX      RrXX    rrXX    rrXX

RY      RRXY     RRXY   RrXY   RrXY

rY       RrXY      RrXY    rrXY    rrXY

F2)  From the whole progeny

       Phenotypic ratio 3:1

       Among females

        Phenotypic ratio 3:1

      Among males

       Phenotypic ratio 3:1

The phenotypic ratio in all cases are 3:1.

b. The eye-color gene is likely autosomal because more females have sepia eyes than males do.

Both males and females exhibit sepia eyes in equal proportions. This is FALSE

a. The eye-color gene is likely autosomal because males and females have similar phenotype ratios.

Males and females do have similar phenotype proportions of red eyes and sepia eyes. This is TRUE

A scientist runs an SDS-PAGE experiment two separate times on a protein with a molecular weight of 200 kD. For the first experiment he treats the protein with SDS only and for the second experiment he treats the protein with both SDS and a reducing agent. If the first gel yields one band showing a molecular weight of 200 kD and the second run yields one band showing a molecular weight of 25 kD, the researcher should conclude that

Which of the following is not an example of waking conscious
mind?
Select one:
a. Solving a math problem
b. Driving a Lamborghini
c. Writing an exam
d. Taking a power
nap​

A _____ is exhibited only when two are present together.


recessive allele

hybrid

purebred

dominant allele

Plant growth is the result of cells dividing during _____.
plss help

brainpop newton's laws of motion worksheet answer key catagorize it answer

WILL GIVE BRAINLIEST!!!!!!​

how does the process of translation convert information from a dna code to an rna code?

a. from a DNA code to an RNA code
b. from an amino acids code to a nucleic acid code
c. from an RNA code to a DNA code
d. from a nucleic acid code to an amino acid code

Cell X
Cell w
Cell Y
Cell Z
Х
х
х
Cell Membrane
x x
х
х
Cell Wall
Chloroplasts
Х
х
DNA
х
х
х
Nucleus
Х
Х
х
Which cell that was viewed is most likely a prokaryote?

Which one of the following does not have its outer orbit full?
a. argon
b. neon
c. krypton
d. lithium

which is false?

- digestion begins in the mouth
- The small intestine digest carbohydrates
- The large intestine absorbs amino acids
- the stomach involves mechanical digestion

help! If a virus has an incubation period of 12-24 months, then it is most likely --

Which characteristic of life best describes the process of homeostasis?
responding to the environment
reproducing
growing and developing
using energy

Answer
A. responding to the environment

punnett Square st. Patrick's Day worksheet... did anyone have the answers..ughh... so confusing!!​

name two characteristics that all these animal share ( frog, buck, doves, lizard, dragonflies )​

What are Purkinje fibers?
special valves that relay electrical impulses to
the ventricles, which cause contraction
special fibers that relay electrical impulses to
the atriums, which cause emptying
special valves that relay blood to the
ventricles, which cause contraction
special fibers that relay electrical impulses to
the ventricles, which cause contraction
DO NE

PLZ HELP ASAP
MARKING

how do data collected from ice cores provide evidence for climate change.

Which best describes the structure of DNA?

A.It has a double helix with repeating bases

B.It has a triple helix with repeating bases

C.it has a double helix with a single base

B.It has a triple helix with a single base

ROCK
Created from the
- of
in ______ over time.





Help me pls

The study of which trees monkeys feed in is part of the life sciences.
Please select the best answer from the choices provided
T
F

What is the main reason to put a telescope in space?
A.
It is much closer to the stars.
B.
It can receive star light that cannot reach Earth.
C.
Light reaching it is not affected by the movement of air.
D.
It can detect objects behind the moon.

The phase of mitosis that is characterized by the arrangement of all chromatids along the equator of the cell is called

RNA differs from DNA in that RNA
A.all of these
B.contains the nitrogenous base uracil
C.contains a different sugar molecule
E.is single-stranded

I would appreciate help please thank you

The DNA during interphase is in _____ strands called _____

PLEASE HELP ME PLEASEE!

The phase of mitosis that is characterized by the disappearance of the nuclear membrane is

PLEASE HELP ME WITH SOME QUESTIONS


1. What is a convection current?

2. How do thermometers work?

Which sex would you expect to be the choosiest?

-2 In a pasture ecosystem a large portion of the biomass is represented
pasture vegetation compared to animals that feed on these grasses.
illustrated by such a pasture ecosystem is called alan...
A food chain.
B food web.
с ecological pyramid.
D energy flow.​