In a cross between a pure bred, red-eyed female fruit fly and a white-eyed male, what percent of the male offspring will have white-eyes? (White eyes are X-linked, recessive)

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04-11-2022
Biology

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In a cross between a pure bred, red-eyed female fruit fly and a white-eyed male, what percent of the male offspring will have white-eyes? (White eyes are X-linked, recessive)

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BentonW252114 BentonW252114 · Answer 1 · 2022-11-04T05:10:55-04:00

As the female is pure-bred (homozygous), its genotype would be XᴿXᴿ. As the male has white eyes and this characteristic is X-linked and recessive, its genotype would be XʳY. So, we must cross those parents and look for the XʳY genotype (white-eyed male) offspring, as follows:

As we can see, there's no probability that we would find a XʳY male in the offspring. This happens because the white eyes is a X-linked characteristic. As the only parent that has white-eyes is the male and males does not pass on X chromosomes to their offspring, no one from the offspring would be XʳY. Therefore, the correct answer is 0%.