Genes and Hormones

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At conception, if the father contributes an X chromosome, the baby will be a female, if a Y, the baby will be male.


Up until 6 weeks, gonads are indentical.

  • The Y chromosome controls development of gaonds producing male sex organs; in the 6th week, the Y chromosome produces a protein to turn the gonads into testes.
  • If this protein isn't present, the gonads develop into ovaries.


  • The testes release androgens which then makes the Wolffian System develops (males).
  • When no androgens


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