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The question assumes that the egg is passive, accepting the first sperm to arrive at the egg. The father can contribute one of two types of chromosome (an X or a Y), but the mother can contribute only one (an X). Two X's make a female; an X and a Y make a male. If both parents contribute X's, they will have a female child. If the father contributes a Y, they will have a male child. Some recent evidence indicates that the underlying assumption is wrong. See the Wikipedia article on "Maternal influence on sex determination."

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14y ago

The sperm from the father can supply either an X-bearing or a Y-bearing chromosome. The egg from the mother can only supply an X-bearing chromosome. An XY combination produces a boy baby. An XX combination produces a girl baby. It might seem that the father therefore determines the sex of the baby, but some recent evidence suggests that the mother can select either an X-bearing or a Y-bearing sperm. See the Wikipedia article on "Maternal influence on sex determination."

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Q: Why mother is not responsible for the sex of the baby?
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