A teratogen is a drug that:a
increases fertility.
b. prevents fertilization.
c. prevents implantation of the embryo in the endometrium.
d. induces labor.
e. interferes with morphogenesis.
E
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If similarities between two structures in different organisms reflect independent evolution, these structures are
A. analogous. B. vestigial. C. homeotic. D. homologous. E. heterologous.
What effect do assortative matings have on populations?
A) They cause one sex to be much different than the other. B) They cause isolated groups to be more similar to each other. C) They increase the rate of mutations. D) They maintain appearance differences between groups.
The shape of the bill on the bird in the accompanying figure is most likely the result of:
a. coevolution.
b. pollination.
c. asexual reproduction.
d. pseudocopulation.
e. inbreeding.
When the polymerase chain reaction (PCR) is used to amplify segments of DNA, the sample is first heated, and then cooled, in cycles. How many cycles of heating and cooling would be necessary to produce 16 times the original quantity of DNA?
a. 16 b. 2 c. 4 d. 6 e. 8