A woman has two X chromosomes in the 23rd pair of chromosomes. A man has one X and one Y. All the mother's eggs carry an X chromosome. About half the father's sperm carry an X and half carry a Y. If a Y-carrying sperm fertilises the egg, the baby will have an X and Y and will be a boy. If an X-carrying sperm fertilises the egg, the baby will be XX - a girl.
Answers
Bhushan Anvekar
A woman has two X chromosomes in the 23rd pair of chromosomes. A man has one X and one Y. All the mother's eggs carry an X chromosome. About half the father's sperm carry an X and half carry a Y. If a Y-carrying sperm fertilises the egg, the baby will have an X and Y and will be a boy. If an X-carrying sperm fertilises the egg, the baby will be XX - a girl.