When we take, say, 100 individuals of a species of beetle from the wild and place them in a new environment that is not so different that they are unable to thrive but different enough so that they are experiencing a new selective regime, say, a lower temperature, what typically happens

Human Anatomy & Physiology (11th Edition)
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When we take, say, 100 individuals of a species of beetle from the wild and place them in a new environment that is not so different that they are unable to thrive but different enough so that they are experiencing a new selective regime, say, a lower temperature, what typically happens?

A -  Sexual selection causes some larvae to be able to survive in the cooler temperatures and other individuals to be unable to survive because they need warmer temperatures.

B - We are unable to measure phenotypic selection, presumably because we do not have much variation among individuals for how they handle temperature.

C - The founder event assures us that the new population will be strictly representative of the source population (especially if we took all the 100 from the same location rather that from throughout the range of the species).

D - The population evolves to be tolerant of the lower temperature; it can do this because of latent variation already in the 100 founding individuals.

E - The population at first doesn't respond to selection for living at lower temperatures; evolution has to wait until new mutations can arise, which generally takes a long time.

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