Which of the mechanisms below increases the amount of genetic variations in a population?
a. Genetic drift
b. Gene flow
c. Bottleneck effect
d. Founder effect
B is quite close, but it defines the existing variation within the population, which is positive but only goes so far if there is not new material being introduced.
C and D decrease the genetic variation of a population
So the right answer is A, because it actually results in new genes being created through mutation.
