Which of the following is incorrect statement?
(a) Extensive use of antibiotics kills bacteria that are susceptible, butresistant variants survive and reproduce
(b) After many generations of directional selection from resistant bacteria, most surviving bacteria are antibiotic sensitive.
(c) The effect of genetic drift intensifies when populations are small.
(d) An allele will lead to an adaptation only if it increases in population as result of natural selection.
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Answer: option b
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