Which of the following are examples of evolution by anthropogenic action?
(a) Evolution of DDT-resistant mosquitoes
(b) Adaptive radiation of marsupial mammals
(c) Evolution of antibiotic-resistant bacteria
(d) Convergent evolution of potato and sweet potato

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(b) and (c)

(a) and (c)

(a) and (b)

answer is C.

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Detailed Solution

Excess use of herbicides, pesticides, etc., has only resulted in selection of resistant varieties in a much lesser time scale. This is also true for microbes against which we employ antibiotics or drugs against eukaryotic organisms/cell. Hence, resistant organisms/cells are appearing in a time scale of months or years and not centuries. These are examples of evolution by anthropogenic action.

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