The sex of a human child is determined by:

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(C) In humans,the sex of the child is determined by the sex chromosomes present in the sperm. Females have $XX$ chromosomes and produce gametes with o

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Sex chromosome of the father

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(C) In humans,the sex of the child is determined by the sex chromosomes present in the sperm. Females have $XX$ chromosomes and produce gametes with only the $X$ chromosome. Males have $XY$ chromosomes and produce two types of sperm: $50\%$ containing the $X$ chromosome and $50\%$ containing the $Y$ chromosome. If a sperm carrying the $X$ chromosome fertilizes the egg,the zygote develops into a female $(XX)$. If a sperm carrying the $Y$ chromosome fertilizes the egg,the zygote develops into a male $(XY)$. Therefore,the father's contribution determines the sex of the child.

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