The maleness of a child is determined by

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(B) In humans,the sex of a child is determined by the sex chromosomes inherited from the parents.Females have two $X$ chromosomes $(XX)$,while males h

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the $Y-$ chromosome in zygote

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(B) In humans,the sex of a child is determined by the sex chromosomes inherited from the parents.Females have two $X$ chromosomes $(XX)$,while males have one $X$ and one $Y$ chromosome $(XY)$.During fertilization,the mother always contributes an $X$ chromosome to the zygote.The father can contribute either an $X$ chromosome or a $Y$ chromosome.If the sperm carrying the $Y$ chromosome fertilizes the egg,the resulting zygote will have an $XY$ genotype,which develops into a male child.Therefore,the presence of the $Y$ chromosome is the deciding factor for maleness.

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