Biology
A certain couple got only four daughters in a row and no son. Does it mean that the husband does not produce Y-bearing sperms? Explain.
Genetics
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Answer
No, it does not mean that the husband does not produce Y-bearing sperms. During conception, half of the sperm released are X-bearing and the other half are Y-bearing. In this case, only the X-bearing sperm fertilized the wife's eggs in each instance. This can happen due to random chance, as the probability of having a male or female child is approximately 50% for each pregnancy.
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