The mother's ovum determines whether the fetus will become a boy or a girl.

Name: The mother's ovum determines whether the fetus will become a boy or a girl.
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It is actually the father's sperm that determines whether the fetus will be a boy or a girl, as it carries either an X or a Y chromosome. If the sperm carries an X chromosome, the fetus will be a girl, whereas if it carries a Y chromosome, the fetus will be a boy. The mother always contributes an X chromosome to the embryo.

The Mother's Ovum Determines Whether the Fetus Will Become a Boy