The Default Gender

Humans are normally born with an X-X or an X-Y chromosome pair which dictates the gender of a person with the X-X being female. It is possible that a person can be born with just an X chromosome without the extra X or Y. When this happens the person defaults to Female which it the default gender for most mammals. The main issue these people have is that they are generally infertile.

(The Great Courses – The Science of Self)

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