X and Y Chromosomes

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  • X and Y Chromosomes
    • They control whether your male or female
      • All men have an X and a Y chromosome: XY
      • All women have two X chromosome: XX
      • When making sperm, the X and Y chromosomes are drawn apart in the first division of meiosis
      • There's a 50% chance each sperm cell gets an X or a Y chromosome
      • All eggs have one X chromosome
    • Genetic Diagrams
      • To find the probability of getting a girl or a boy
      • Put the possible gametes from one parent down the side, and those off the other parent along the top
      • In the middle fill in the letters from the top and the side
      • There are two XX results and two XY results, so there's a 50:50 ratio in pregnancy

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