Biology for IGCSE & O level - Variation And Selection (Section 5 - No. 11)
In a population of insects, some individuals have a mutation that makes them resistant to a certain pesticide. What will happen to the proportion of pesticide-resistant insects over several generations if the area is sprayed with the pesticide?
The proportion of resistant insects will stay the same.
The proportion of resistant insects will decrease.
The proportion of resistant insects will increase.
The pesticide will cause the insects to gain a different mutation.
Explanation
Natural selection favors the pesticide resistant insects; they will survive and reproduce more successfully.
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