In humans,sex determination is caused by:

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(A) In humans,the chromosomal mechanism of sex determination is of the $XX-XY$ type.Females are homogametic,producing gametes with $22 + X$ chromosome

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Father's sex chromosomes

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(A) In humans,the chromosomal mechanism of sex determination is of the $XX-XY$ type.Females are homogametic,producing gametes with $22 + X$ chromosomes.Males are heterogametic,producing two types of sperm: $22 + X$ and $22 + Y$.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 sex of the child is determined by the sex chromosome contributed by the father.

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