Question

there are two populations of trout in an area, both of which inhabit a different lake. these lakes are connected by a stream, and trout from these two populations are able to breed with one another. this is an example of:
○ gene flow.
○ genetic drift.
○ the founder effect.
○ the bottleneck effect.

Explanation:

Gene flow refers to the transfer of genetic material between populations through interbreeding. Here, trout from two different lakes (populations) can breed, which allows genetic exchange—this matches the definition of gene flow. Genetic drift is random change in allele frequencies, the founder effect is a type of genetic drift from a small founding population, and the bottleneck effect is genetic drift from a population reduction, none of which apply here.

Answer:

gene flow.