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(A) In male Drosophila,the sex chromosomes are $XY$. The genes $y$ and $w$ are located on the $X$-chromosome,while the $Y$-chromosome does not carry t

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$2$

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(A) In male Drosophila,the sex chromosomes are $XY$. The genes $y$ and $w$ are located on the $X$-chromosome,while the $Y$-chromosome does not carry these alleles.Since the male is hemizygous for these genes,it will produce two types of gametes during meiosis:$1$. Gametes containing the $X$-chromosome with the $y$ and $w$ alleles.$2$. Gametes containing the $Y$-chromosome (which lacks these alleles).Therefore,the total number of types of gametes produced is $2$.

How many types of gametes will be produced by a male Drosophila having the following arrangement of two genes ($y$ and $w$) on the $X$-chromosome?

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