Temporal isolation is an example of
A) neither a premating nor a postmating isolation mechanism.
B) a premating isolating mechanism.
C) both a premating and a postmating isolation mechanism.
D) a postmating isolating mechanism.
B
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Which of the following are correct pairings of histone variants and their functions?
A. H3.3 ? stabilizes the open state (transcriptionally active) B. CENPA ? maintains kinetochore attachment C. H2AX ? DNA repair D. macroH2A ? X chromosome inactivation E. All of these choices are correct.
The evolution of __________ was crucial in the
evolution of plants from aquatic to terrestrial environments. a. roots b. leaves c. stems d. stomata e. all of these
As a biologist, you are researching a population of moles. In the course of your research, you identify a nearby population that occasionally comes into contact with your study population. What best describes the evolutionary process at work?
A. mutation B. natural selection C. artificial selection D. gene flow E. genetic drift
____ does not contribute to genetic variety.
A. Independent assortment B. Cytokinesis C. Sexual reproduction D. Crossing-over