Which of the following occurs in cells of human individuals with three or more X chromosomes?
a. Two X chromosomes remain active, and all others are inactivated.
b. One X chromosome remains active, and the rest are inactivated.
c. All of the X chromosomes remain active.
d. Two X chromosomes remain active in females and one remains active in males; the rest are inactivated.
Ans: b. One X chromosome remains active, and the rest are inactivated.
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The spaces between adjacent Schwann cells are called ____
a. nodes of Ranvier b. axon terminals c. dendrites d. intercalated discs e. active gaps
Identify and briefly explain the four premises of evolution by natural selection, as proposed by Charles
Darwin. What will be an ideal response?
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A. anther; ovary B. stigma; embryo sac C. anther; receptacle D. synergid; egg E. anther; stigma