What Determines Whether a Baby Is a Boy or Girl? Explaining Chromosome Roles

Learn how a baby's sex is determined at conception through X and Y chromosomes carried by sperm and egg cells.

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The sex of a baby is determined at conception. Sperm cells carry either an X or a Y chromosome, while the egg always carries an X chromosome. When a sperm with an X chromosome fertilizes the egg, the result is a XX combination, creating a girl. Conversely, when a sperm with a Y chromosome fertilizes the egg, the result is an XY combination, resulting in a boy.

FAQs & Answers

  1. How is a baby's sex determined? A baby's sex is determined at conception by the combination of sex chromosomes inherited: an X chromosome from the egg and either an X or Y chromosome from the sperm.
  2. What role do sperm chromosomes play in determining baby gender? Sperm carry either an X or a Y chromosome; if the sperm contributes an X chromosome, the baby will be female (XX), and if it contributes a Y chromosome, the baby will be male (XY).
  3. Can the mother influence whether the baby will be a boy or girl? The mother always contributes an X chromosome; the baby's sex depends on whether the sperm carries an X or Y chromosome, so the mother's genetic contribution does not determine the sex.

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