A male child would be born to parents if | vedclass

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(D) In humans,sex determination is based on the sex chromosomes. Females have a pair of $XX$ chromosomes,while males have $XY$ chromosomes. During fer

Vedclass · Accepted Answer

Genetic chromosomal constitution of child is $XY$

Vedclass · Answer

(D) In humans,sex determination is based on the sex chromosomes. Females have a pair of $XX$ chromosomes,while males have $XY$ chromosomes. During fertilization,the mother always contributes an $X$ chromosome. If the father contributes an $X$ chromosome,the zygote becomes $XX$ (female). If the father contributes a $Y$ chromosome,the zygote becomes $XY$ (male). Therefore,a male child is born when the genetic chromosomal constitution of the child is $XY$.

$A$ male child would be born to parents if

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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.

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