1. Sexual development begins with chromosomes. A person with two X chromosomes typically will be female, and...

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1. Sexual development begins with chromosomes. A person with two X chromosomes typically will be female, and a person with an X and a Y typically will be male. Variations in the number of sex chromosomes may lead to Turner syndrome (45,X), Klinefelter syndrome (47,XXY), and Jacobs syndrome (47,XYY), among other conditions. (LO1)

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