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(C) In humans,the sex of the baby is determined by the sex chromosomes. Females have two $X$ chromosomes $(XX)$,so every egg produced by the mother ca

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$A$ sperm can have either of the two sex chromosomes,while the egg has only one type.

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(C) In humans,the sex of the baby is determined by the sex chromosomes. Females have two $X$ chromosomes $(XX)$,so every egg produced by the mother carries an $X$ chromosome. Males have one $X$ and one $Y$ chromosome $(XY)$. During spermatogenesis,$50\%$ of the sperms receive an $X$ chromosome and $50\%$ receive a $Y$ chromosome. If a sperm carrying an $X$ chromosome fertilizes the egg,the zygote will be $XX$ (female). If a sperm carrying a $Y$ chromosome fertilizes the egg,the zygote will be $XY$ (male). Therefore,the sperm is the decisive factor because it can carry either an $X$ or a $Y$ sex chromosome.

It is a commonly held misconception that the mother's egg is responsible for determining whether the baby will be a boy or a girl. But actually,it is the father's sperm that decides this. Which of the following makes the sperm the decisive factor?

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