BY5.4 Sex Linked Inheritance

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Sex determinism:

  • non sex chromosomes are known as autosomes
  • of the 23 pairs of chromosomes, 22 pairs are autosomes and one pair are sex chromosomes
  • males have disimilar sex chromosomes: XY
  • females have similar sex chromosomes: **
  • all female eggs contain X chromosomes
  • half of the sperm contain an X chromosome, half contain a Y chromosome
  • the fertilised egg is either joined by an X sperm or a Y sperm
    • there is an equal chance of having a boy or  a girl

Sex linked inheritance:

  • some alles are carried on the X chromosome
  • they are known as being sex linked
  • the Y chromosome is smaller than the X and carries very few genes
  • sex linkage: recessive genes carried on the X chromosome express themselves…


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