Two populations of mice living in the same forest are separated by a large water-filled ditch. After a rainstorm, flooding brings several mice from one population to the other population. When the mice from the first population reproduce with members of the second population, which of the following will likely occur?

a. All the offspring will die as a result of reproductive mutations.
b. The offspring will be forced to leave the second population.
c. The offspring will be genetically identical to their parents from the first population.
d. The offspring in the second population will have greater genetic variety.