According to the Lyon Hypothesis During the Early Period of Embryonic

According to the Lyon hypothesis during the early period of embryonic development, the

A) genetic activity of both of the X chromosomes in each cell of a female embryo is inactivated.
B) genetic activity of one of the X chromosomes in each cell of a female embryo is inactivated.
C) genetic activity of the Y chromosome in each cell of a male embryo is inactivated.
D) inactivated chromosome forms a structure known as the pronucleus.

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