AAMC SA BS Q108

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Oh_Gee

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the answer says choice D is correct "XiY males have no sons, only daughters all of whom have the Xi gene" but that is not what the answer choice itself is saying. i eliminated this answer because it said XsY flies pass their X to only 1/2 their offspring, which i didn't was true because they of course pass their X chromosomes to all their daughers. can someone explain this question more clearly to me?
 

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