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  • Deciphering the Language of Sex

    Deciphering the Language of Sex


    (58 min 51 sec) Is it a boy or a girl? Dr. David Page looks at how we define male and female and summarizes the development of human sex characteristics.

  • Meiosis



    (5 min 53 sec) Meiosis, the form of cell division unique to egg and sperm production, sets the stage for sex determination by creating sperm that carry either an X or a Y sex chromosome. But what is it about the X or Y that determines sex? Also available in Spanish.