Select the incorrect statement.

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(B) In $XO$ type of sex determination (e.g.,grasshoppers),males produce two types of gametes: $50 \%$ with an $X$ chromosome and $50 \%$ without any s

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In domesticated fowls,sex of progeny depends on the type of sperm rather than egg.

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(B) In $XO$ type of sex determination (e.g.,grasshoppers),males produce two types of gametes: $50 \%$ with an $X$ chromosome and $50 \%$ without any sex chromosome. Thus,statement $A$ is correct.In birds (including domesticated fowls),sex determination is of $ZW-ZZ$ type. Here,females are heterogametic $(ZW)$ and males are homogametic $(ZZ)$. Therefore,the sex of the progeny depends on the type of egg,not the sperm. Thus,statement $B$ is incorrect.In humans,males are $XY$. The $Y$ chromosome is significantly shorter than the $X$ chromosome. Thus,statement $C$ is correct.In fruit flies $(Drosophila)$,males are $XY$ (heterogametic) and females are $XX$ (homogametic). Thus,statement $D$ is correct.

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