Explain why lacOc mutations are cis-acting while lacI mutations can be trans-acting
What will be an ideal response?
The operator region does not produce a diffusible product, whereas the lacI gene does.
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Which of the following is consistent with the out-of-Africa hypothesis?
A) Modern Homo sapiens can trace their origin back to Neanderthals. B) Modern Homo sapiens can trace their origin back to Homo erectus. C) Interbreeding between early hominin species in Europe and Asia lead to the distinctive features of modern Homo sapiens. D) Homo sapiens have a common ancestor with Neanderthal and Homo erectus from Africa but did not interbreed with them. E) Modern Homo sapiens and Neanderthals have no common ancestor more recent than the first mammals.
The passage of an arthropod through stages from egg to adult is
A. differentiation. B. evolution. C. graduation. D. metamorphosis. E. succession.
Which of the following organisms is NOT a
cephalopod?
a. slug b. octopus c. squid d. nautilus e. more than one of these is NOT a cephalopod
Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
1. well-adapted individuals leave more offspring than do poorly adapted individuals 2. a change occurs in the environment 3. genetic frequencies within the population change 4. poorly adapted individuals have decreased survivorship a. 2, 4, 1, 3 b. 4, 2, 1, 3 c. 4, 1, 2, 3 d. 4, 2, 3, 1 e. 2, 4, 3, 1