Major gene reshuffling takes place during
a. telophase I.
b. metaphase I.
c. anaphase I.
d. metaphase II.
e. anaphase II
B
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Escherichia coli and Clostridium acetobutylicum are reported to be derived from a common ancestor. They have some similar, but not identical gene sequences. What is the best explanation for this difference in genetic coding?
A. After the two species diverged, the similar gene sequences evolved through convergent evolution. B. The two species never diverged, but were discovered by two different scientists and given different names. C. After the two species diverged, the genes accumulated random mutations that resulted in similar, but not identical gene sequences. D. The two species are not closely related, but E. coli passed the similar gene sequences to C. acetobutylicum via horizontal gene transfer.
Which chemical released by white blood cells causes arterioles to dilate?
a. cytokines b. histamine c. interferons d. complement e. interleukins
Urbanization impacts
A) all species positively. B) all species negatively. C) most species negatively, but a few positively. D) most species positively, but a few negatively.
The movement of 25-year-old fertile individuals between Mexico and Canada will eventually
contribute to: a. genetic drift. b. directional selection. c. natural selection. d. gene flow. e. mutation.