The Third one third onewould be the the best answer.
D. The offspring in the second population will have greater genetic variety
This is because since these mice have never reproduced together before, the different genes will reproduce, introducing new genetic variety into the population.
Answer: Gene flow is the movement of alleles from one population to another as a result of the migration of individuals. This causes a reduction in the differences between populations. ... Genetic drift is a change in allele frequencies due to change of events in a small breeding population.