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(C) In humans,sex determination is based on the $XY$ chromosome system. During fertilization,the male gamete (sperm) can carry either an $X$ chromosom

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$50$

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(C) In humans,sex determination is based on the $XY$ chromosome system. During fertilization,the male gamete (sperm) can carry either an $X$ chromosome or a $Y$ chromosome,while the female gamete (ovum) always carries an $X$ chromosome. When an $X$-carrying sperm fertilizes an $X$-carrying ovum,a daughter $(XX)$ is produced. When a $Y$-carrying sperm fertilizes an $X$-carrying ovum,a son $(XY)$ is produced. Since the chance of a sperm carrying an $X$ or $Y$ chromosome is equal,the probability of having a son or a daughter in any given pregnancy is always $50 \,\%$. Previous births do not influence the genetic outcome of future pregnancies.

$A$ couple has three daughters. What is the probability of having a son in the next pregnancy (in $,\%$)?

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