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SciShow
There Are More Than Two Human Sexes
In high school biology, we learn that humans are born with either XX or XY chromosomes, and that a person’s internal and external sex organs match those chromosomes. It turns out, however, that sex isn’t that straightforward.
Howard Hughes Medical Institute
Hhmi: Biointeractive: Sex Determination: Meiosis
See how an X or Y chromosome carried by a sperm cell, determines the sex of the offspring in this video. [5:52]