Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

Development of transgenic animals

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Production of 'Dolly', the sheep by cloning

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Prevalence of pesticide resistant insects

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Development of organs from 'stem cells' for organ transplantation

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Solution

The correct option is B Prevalence of pesticide resistant insects
When pesticides are sprayed, all the insect pests are not killed and some survive and also may reproduce. Over a period of time, a new species of pest resistant insects will evolve. This is an example of natural selection, whereby pesticide resistant insects are selected naturally to leave greater number of progeny in next generation and be reproductively successful.

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