In fruit flies eye color is a sex linked trait where red eyes are dominant to the white eye phenotype. If a male with red eyes is crossed with a purebred white eye female, what is the ratio of eye color and sex phenotypes for their offspring?
A. 1 red eye female : 0 white eye female: 0 red eye male : 1 white eye male
B. 2 red eye female : 1 white eye female: 0 red eye male : 1 white eye male
C. 1 red eye female : 1 white eye female: 1 red eye male : 1 white eye male
D. 0 red eye female : 1 white eye female: 1 red eye male : 0 white eye male

2 red eye females : 2 white eye males

Explanation:

The ratio of eye color and sex phenotypes for their offspring would be 2 red eye females : 2 white eye males.

Let the allele for eye color be represented by A (red eye) and the alternate form a (white eye).

In fruitfly, XY individuals are males while XX are females.

Hence;

A male with red eye will have the genotype -

A purebred white eye female will have the genotype -

Crossing the male and the female:

  x  

Progeny:

Phenotypes of the progeny:

2 - red eye, females

2 - white eye, males.

The ratio of eye color and sex phenotypes of their offspring are 2 red eye females : 2 white eye males

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