Sex Determination

• What two chromosomes determine sex in humans?

  X and Y
• What is the sex chromosome pair for a male?

  XY
• What is the sex chromosome pair for a female?

  XX
• Which parent decides the sex of the baby?

  Father
• What type of chromosome do all eggs carry?

  X
• What type of chromosome can sperm carry?

  X or Y
• What is the chance of having a girl in each pregnancy?

  50%
• What is the chance of having a boy in each pregnancy?

  50%
• If the baby inherits an X from the father and an X from the mother, what sex will it be?

  Female
• If the baby inherits a Y from the father and an X from the mother, what sex will it be?

  Male