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The equal chance of a baby being born a girl or boy is primarily due to the mechanism of sex determination in humans, which involves the combination of sex chromosomes from both parents. Males carry one X and one Y chromosome (XY), while females have two X chromosomes (XX). When a sperm fertilizes an egg, it can contribute either an X or a Y chromosome, resulting in a 50% probability for either sex. This genetic randomness, combined with the large number of sperm and eggs involved in reproduction, ensures that the likelihood of having a boy or a girl is approximately equal.

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4w ago

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