During development, an XX female embryo will form one of the X chromosomes in each cell into a Barr body.This usually occurs

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The formation of a Barr body, which is the inactivation of one of the X chromosomes in each cell of a female embryo, typically occurs about two weeks after zygote formation. This process ensures that females, like males, have only one functional copy of the X chromosome in each body cell.

During Development, an XX Female Embryo Will Form One of the X