Mendel's dihybrid crosses, but not his
monohybrid crosses, show that
a. some genes are linked together.
b. the two alleles controlling a trait are
divided equally among the gametes.
c. alleles for different traits are inherited
independently.
d. one of the pair of alleles is dominant to the
other.
e. the crossing of two different homozygous
forms will not produce any offspring in the
first generation that will look like either of
the parents.
C
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How do anoxygenic phototrophs benefit from possessing accessory pigments that allow light to be harvested at deeper areas of a fluid environment?
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Evaporation of water from the surface of leaves is
A. hydrolysis. B. oxidation. C. transpiration. D. condensation. E. sublimation.
Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three- to five-year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?
A) Periodic crowding affects the endocrine system, resulting in increased aggressiveness. B) Increases in population density lead to increased rates of predation. C) Increases in rates of herbivory lead to changes in the nutritive value of plants used as food. D) Increases in population density lead to more proximal infestations of parasites to host animals. E) All of the above are plausible explanations of population cycling.
Humans cannot survive at sea by drinking salt water. However, marine vertebrates such as sea turtles and various sea birds can survive by drinking salt water. What do they have that humans do not?
A. The ability to secrete salts and wastes into their intestinal contents like an insect B. Salt glands C. They use ammonia as their primary nitrogenous waste D. Body fluid concentrations that are similar to or greater than those of seawater E. Kidneys that are extremely good at producing a concentrated urine