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  • (a) Why is the collection of white winged moths and dark winged moths made in England between considered a good example of natural selection? (b) ‘

(a) Why is the collection of white winged moths and dark winged moths made in England between 1850-1920 considered a good example of natural selection?

(b) ‘‘Evolution is based on chance events in nature and chance mutations in organisms.’’ Justify the statement.

 

 

Answers (1)

a)During the pre-industrialisation all the white-winged moths survived due to white coloured lichens on trees, but during post-industrialisation, white-winged moths were unable to survive as predators could spot the moth against contrasting background, and the dark-winged moths survived, this showed that in a mixed population of white and dark-winged moths those who can adapt better will survive.

b) The excess use of herbicides and pesticides has resulted in the selection of resistant varieties that developed due to the chance or random mutation.

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Safeer PP

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