The total DNA content of each daughter cell is reduced during meiosis because
a. chromosomes do not replicate during the interphase preceding meiosis I.
b. chromosomes do not replicate between meiosis I and II.
c. half of the chromosomes from each gamete are lost during fertilization.
d. sister chromatids separate during anaphase of meiosis I.
e. chromosome arms are lost during crossing over.
Ans: b. chromosomes do not replicate between meiosis I and II.
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Considerably more phenotypic variation exists in domesticated varieties of species like dogs and cabbages than exists in non-domesticated species like lions and maple trees. Which one of the following statements best explains why this is true?
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The autonomic nervous system
a. is part of the peripheral nervous system. b. is part of the central nervous system. c. relays commands to smooth muscles. d. is under involuntary control. e. is described by more than one of these
The relationship between strands of RNA and DNA
is a. antagonistic. b. opposite. c. complementary. d. an exact duplicate. e. unrelated.
In this diagram of a negative feedback system, what
labeled box represents an effector? a. A b. B c. C d. A and B e. None of these