The given diagram illustrates the change that occurred in the frequency of phenotypes in an insect population over 10 generations. A probable explanation for this change would be:

Over time there was a decrease in the adaptive value of gene

a

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Over time there was an increase in the adaptive value of gene

a

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Over time there was an increase in the population of

A A, A a

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Over time there was a decrease in the mutation rate of gene

a

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Solution

The correct option is B Over time there was an increase in the adaptive value of gene $a$
Population genetics shows us that certain traits of a species becomes more abundant if they benefit the species. In this case, plants must have camouflaged the insects. Initially, the number of AA/Aa insects were higher than aa insects. But after 10 generations, the the number of AA/Aa insects decrese while that of aa insects increse. This suggests that over time there was an increase in the adaptive value of gene $a$ .

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