At the time of fertilization, the maturation of the human oogonium has resulted in _____
A) one secondary oocyte
B) two primary oocytes
C) four secondary oocytes
D) four zygotes
A
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The biological basis of nicotine addiction is that nicotinic receptors bind
A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings. B) postsynaptic receptors that normally bind endorphins. C) the dopaminergic receptor, releasing acetylcholine, which causes the pleasurable feelings. D) the pleasure center in the brain.
The few ancestors of the Galàpagos finches who colonized the islands would be an example of
A. a founder effect. B. a bottleneck. C. increased mutation rate. D. natural selection. E. gene flow.
Which of the conditions necessary to maintain
genetic equilibrium is the least likely to occur in a natural population?
a. no mutations b. an infinitely large population c. a population isolated from other populations d. random mating e. all individuals producing the same number of offspring
The persistence of the sickle-cell anemia allele in the
African population is the result of a. a high rate of mutation of the normal allele to the sickle-cell anemia allele. b. the advantage of the heterozygous form over the homozygous forms. c. nonrandom mating. d. a decline in the occurrence of malaria in Africa. e. genetic drift.