4. A population of insects is found on an island. When discovered, the population is 60% green and 40% brown. A hurricane strikes the island, randomly killing a large portion of the insect
population. When scientists return after the hurricane, the population is found to be 20% green
and 80% brown. This sudden change in the allele frequencies due to the hurricane is best
described as -
A recombination
B mutation
C genetic drift
D gene flow