Incompatibilities between the developing embryo and the maternal organism that cause the embryo to
abort spontaneously may prevent individuals of different populations from producing fertile offspring.
Such differences may be an example of
a. isolating mechanisms.
b. allele frequencies.
c. mutations.
d. founder effects.
e. gene flow.
A
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Which gland produces/releases hormones that have the widest range of effects on the body?
a. pineal b. pituitary c. thyroid d. adrenal e. pancreas
The data of Huey and colleagues (1989 ) on thermoregulation in garter snakes is an example of the ________ method evolutionary biologists use to test hypotheses about adaptations
A) situational B) experimental C) observational D) phylogenetic contrast E) comparative
In a large population on a Pacific island, a few individuals had a mutation that caused them to have different colored
eyes. After a hurricane, the population was reduced to only a few individuals, but some of those individuals had the rare eye color mutation. Now, after many generations, almost half of the population on this island has different colored eyes. This is an example of _____________________. Fill in the blank(s) with the appropriate word(s).
One experiment in phototropism involved cutting off the tips of grass seedlings before exposing them to light from one side. The decapitated seedlings did not bend toward the light. A valid conclusion from this experiment would be that
A) plants cannot engage in photosynthesis without the tip of the plant. B) light is perceived by the tip of grass plants. C) a foil cover over the tip of the seedlings would cause them to bend. D) hormones are produced in all parts of the plant.