In the fruit fly Drosophilia, eye color is sex-linked. The allele for red eyes is dominant (Xw) and the allele for white eyes is recessive (Xw).

A scientist crosses two red-eyed flies and notice that half of their male offspring have white eyes.

What are the genotypes of the parents?

Answer:
For the father to have a normal phenotype, he must have a genotype of XW Y. For the mother to give a white allele to her sons, she must have a genotype of XW Xw.

Question

15-08-2022
Biology

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In the fruit fly Drosophilia, eye color is sex-linked. The allele for red eyes is dominant (Xw) and the allele for white eyes is recessive (Xw).

A scientist crosses two red-eyed flies and notice that half of their male offspring have white eyes.

What are the genotypes of the parents?

Answer:
For the father to have a normal phenotype, he must have a genotype of XW Y. For the mother to give a white allele to her sons, she must have a genotype of XW Xw.

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luisvaschetto luisvaschetto · Answer 1 · 2022-08-16T19:08:52+02:00

The father's genotype is X^W, Y whereas for the mother the genotype is X^W, X^w because it is inherited trough sex chromosomes (1 or 2 sex chromosomes and 2 sets of autosomes).

What is a sex-linked trait?

A sex-linked trait is any phenotypic characteristic that is from parents to offspring n inherited through the sex chromosomes.

In this case, the eye color is sex-linked and the trait will depend on the sex chromosomes of the parents, which may lead to different phenotypic proportions in the offspring.

In conclusion, the father's genotype is X^W, Y whereas for the mother the genotype is X^W, X^w.

Learn more about sex-linked traits here:

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