In humans,the determination of a female offsp | vedclass

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(B) In humans,the sex of the offspring is determined by the sex chromosomes of the father. Females have $XX$ chromosomes and produce only one type of

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Fusion of an $X$-chromosome-bearing ovum with an $X$-chromosome-bearing sperm.

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(B) In humans,the sex of the offspring is determined by the sex chromosomes of the father. Females have $XX$ chromosomes and produce only one type of gamete (ovum) containing an $X$ chromosome. Males have $XY$ chromosomes and produce two types of gametes: $50\%$ containing an $X$ chromosome and $50\%$ containing a $Y$ chromosome. When an $X$-chromosome-bearing sperm fertilizes an $X$-chromosome-bearing ovum,the resulting zygote is $XX$,which develops into a female offspring. Therefore,the fusion of an $X$-chromosome-bearing ovum with an $X$-chromosome-bearing sperm results in a female.

In humans,the determination of a female offspring is decided by which of the following?

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