Assertion : In humans,the gamete contributed | vedclass

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Question

(C) In humans,sex determination is based on the type of sperm that fertilizes the egg.Human males are heterogametic,producing two types of gametes: $5

Vedclass · Accepted Answer

If the Assertion is correct but Reason is incorrect.

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(C) In humans,sex determination is based on the type of sperm that fertilizes the egg.Human males are heterogametic,producing two types of gametes: $50\%$ with an $X$ chromosome and $50\%$ with a $Y$ chromosome.If a sperm carrying an $X$ chromosome fertilizes the egg,the zygote develops into a female $(XX)$.If a sperm carrying a $Y$ chromosome fertilizes the egg,the zygote develops into a male $(XY)$.Therefore,the assertion is correct.However,sex in humans is determined by the presence or absence of the $Y$ chromosome (specifically the $SRY$ gene),not by a polygenic trait involving cumulative effects of genes on $X$ and $Y$ chromosomes.Thus,the reason is incorrect.

Assertion : In humans,the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.

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Assertion : In humans,the gamete contributed by the male determines whether the child produced will be male or female.Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.