Question 91 Bio Qpack

[Bigbang_333]

In a laboratory population of Drosophila, all the males are XsY. Among the females, 15% are XiXi, 50% are XiXs, and 35% are XsXs. Assuming random mating, what proportion of male flies in the next generation will be XiY?

can someone please help me with this question?

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[JimKimSlim]

Draw a punnet square. All males from XiXi mother will have XiY genotype, so there’s 15%. Only half of males from XiXs mother will have XiY genotype, so there’s additional 25%. Finally, none of the males from XsXs mother will have the desired genotype. Thus, 15% + 25% = 40%