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In females the XX germ cells undergo the same migration but on reaching the urogenital ridge and gonads no such meiosis inhibitor factor is present. Therefore the XX germ cells undergo mitosis between the primitive streak until the urogenital ridge where they switch to meiosis. This process continues in the female until birth.
    
===Bipotential Gonadal Phase===
 
===Bipotential Gonadal Phase===
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