According to the Lyon hypothesis, during the early period of embryonic development:
A) the genetic activity of both of the X chromosomes in each cell of a female embryo is inactivated.
B) the genetic activity of one of the X chromosomes in each cell of a female embryo is inactivated.
C) the genetic activity of the Y chromosome in each cell of a male embryo is inactivated.
D) the inactivated chromosome forms a structure known as the pronucleus.
Correct Answer:
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Q15: Primitive germ cells:
A) have 23 chromosomes and
Q17: After metaphase of the first meiotic division
A)
Q17: If both loci for blood are AO,:
A)
Q19: Chromosomes line up at the equatorial plate
Q20: Which of the following statements is true
Q21: Cyclic neutropenia:
A) is characterized by episodes that
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