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how a person's cells could contain three sex chromosmes? XXY.

  • biology -

    You might begin here:


  • biology -

    What you are talking about is Klinefelter's syndrome, which occurs about once every 500-1000 births. He (a male because he has a Y chromosome) will typically have small external genitals, female secondary sex characteristics, reduced sex drive, erection problems, gender identity problems, be sterile, and have a greater likelihood of mental retardation.

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    I hope this helps a little more. Thanks for asking.

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