Physically, We All Began As Female

Physically, We All Began As Female

Men have nipples because they are formed before the activation of the Y chromosome in embryonic development.

We were all female

01:50

from ASAPScience

Key Facts In This Video

  • 1

    Physically speaking, all humans were once "female" in the womb—though some prefer to say we were gender neutral. (0:02)

  • 2

    The first 5–6 weeks of embryonic development involve only the X chromosome, not the Y chromosome. (0:32)

  • 3

    Nipples form before the activation of the Y chromosome in embryonic development. (1:28)

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