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Criteria for Autogamy to Take Place

Which of the ...

Question

Which of the following explains that within 2 years of the introduction of a new antibiotic, bacteria shows resistance to that antibiotic?

A

Divergent evolution

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B

Adaptive radiation

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C

Directional selection

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D

A and C only

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E

A, B and C

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Solution

The correct option is B Directional selection
Divergent evolution leads to divergence of existing population by accumulation of adaptive traits. Adaptive radiation is diversification of organisms into different forms to fulfill various ecological niche. Directional selection refers to appearance of new trait in population and selection of population exhibiting the trait owing to its reproductive fitness. Antibiotic resistance is not result of evolution but selection of genes that confer resistance to the existing bacterial species and thereby increasing the frequency of the gene in the population i.e., directional selection.
Therefore, the correct answer is option C.

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Q. The mechanism by which bacteria became resistant to the introduction of new antibiotic in less than 2 years is known as
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Criteria for Autogamy to Take Place

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