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

Question 36

Multiple Choice

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

A) about two weeks after zygote formation.
B) by the end of the first trimester.
C) at the 16-cell stage.
D) in the X that is the most recessive.

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