A(n) ________ cross yields a genotypic ratio of 121 and a phenotypic ratio of 31.
A) allelic
B) monohybrid
C) test
D) dihybrid
B) monohybrid
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When nitric oxide is used in the dilation of smooth muscle cells, which of the following would interfere with the relaxation of the smooth muscle cells? Inhibitors of
A) calcium release by the ER. B) nitric oxide. C) guanylyl cyclase. D) calmodulin. E) all of the above
Maternal effect genes
A. are all found on the X chromosome. B. are expressed only in female offspring. C. can encode proteins that get translated upon fertilization to establish concentration gradients that span the egg. D. are expressed only in male offspring because they are hemizygous. E. are expressed when exposed to high concentrations of estrogen.
A typhoon devastates a population on "island A" and only a few individuals survive. Several generations later, the replenished population suffers from several inherited disorders that are very rare in other groups. A genetic event that explains this is
A) a population bottleneck. B) genetic load. C) a founder effect. D) natural selection.
Having species within a community that are redundant with respect to ecosystem functions is called
the ____.
a. redundancy hypothesis b. ecosystem function hypothesis c. biological insurance hypothesis d. natural community hypothesis e. fungal take over hypothesis