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

question 18

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 has the most recessive alleles.

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