Question

Which is an example of the bottleneck effect?

A)Green beetles move to a new location and build a new colony there.

B)Green beetles survive as birds don't see them, whereas brown beetles get detected.

C)Insecticide spraying eliminates all but a few of the beetles on an island.

Answer 1

c) If we spray insecticide, only those who are resistant to the insecticide will survive.
That is what the bottleneck effect entails - a sharp reduction in the population and the survival of only a few.