Allopatric speciation occurs because a population
A. merges with another population of the same species.
B. becomes geographically isolated and undergoes genetic change.
C. becomes extinct and is replaced by a population of a different species.
D. shows little genetic change from generation to generation.
E. experiences hybrid sterility.
B. becomes geographically isolated and undergoes genetic change.
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Which of the following is found in angiosperms but not in gymnosperms?
A) seeds B) pollen C) cones D) microsporangia E) anthers
Four of the five answers listed below concern cells with two chromosome sets. Select the exception
a. zygote b. somatic cells c. gamete d. diploid e. skin cells
Concerning diatoms' potential use as drug-delivery systems, which anatomical feature would seem to be most important?
a. their ability to withstand immense pressure b. the chemical composition of their cell walls c. the porous nature of their cell walls d. the chemical composition of their food-storage material e. the nuclear envelope
If after several generations 30 percent of the males have antlers with 9 to 11 points, 40 percent have antlers with 15 to 17 points, and 20 percent have antlers with 12 to 14 points, this development will have been the result of:
A) directional selection. B) disruptive selection. C) stabilizing selection. D) founder effect.