Cinnabar eyes is a sex-linked recessive characteristic in fruit flies in which the eyes of the individual are lighter in color than the normal wild-type red color.If a female having cinnabar eyes is crossed with a wild-type male,what percentage of the F₁ males will have cinnabar eyes? A)0% B)25% C)50% D)100%

Question

Quizplus · Accepted Answer

Since cinnabar eyes are a sex-linked recessive trait, and the female (XX) has cinnabar eyes, she must have two recessive alleles (cc). The wild-type male (XY) has the dominant allele (C) on his X chromosome. All male offspring (XY) will inherit their X chromosome from their mother and their Y chromosome from their father. Therefore, all male offspring will have the genotype (cY) and exhibit cinnabar eyes.

Cinnabar Eyes Is a Sex-Linked Recessive Characteristic in Fruit Flies