A cross is made between a female drosophila heterozygous for the recessive alleles cn (cinnabar eye) and y (yellow body), also recessive, and a cinnabar male with normal body color. among the female progeny the phenotypes were 1/2 wild type and 1/2 cinnabar. among the male progeny the phenotypes were 1/4 yellow body, 1/4 cinnabar, 1/4 wild type, and 1/4 cinnabar and yellow body. from these data, it can be determined that most likely

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23-08-2018
Biology

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A cross is made between a female drosophila heterozygous for the recessive alleles cn (cinnabar eye) and y (yellow body), also recessive, and a cinnabar male with normal body color. among the female progeny the phenotypes were 1/2 wild type and 1/2 cinnabar. among the male progeny the phenotypes were 1/4 yellow body, 1/4 cinnabar, 1/4 wild type, and 1/4 cinnabar and yellow body. from these data, it can be determined that most likely

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Answer;

-y (yellow body) is sex-linked and cn(cinnabar eye) is autosomal. Cinnabar is segregating in a the expected 1:1 ratio and half the males are yellow but none of the females are.

Explanation;

-Genes on the X or Y chromosome are called sex-linked. Sex-linked traits are genetic characteristics determined by genes located on sex chromosomes. Sex chromosomes are found within our reproductive cells and determine the sex of an individual. In this case, the trait, y (yellow body) is sex-linked.

-An autosomal trait is any trait not dependent on sex. It is the one where the gene responsible for the trait is carried by Autosomes or body cell chromosomes. The Cn (Cinnabar eye) is an autosomal trait.