Question

which of the following cannot occur when a population is in reproductive isolation from others of its kind?
mutation
nonrandom mating
natural selection
gene flow

Explanation:

1. Understand each concept:

• Mutation: A change in DNA, can occur in any isolated population as it's a random change in an individual's genome.
• Nonrandom mating: Mating based on preferences (e.g., assortative mating), can happen within an isolated population.
• Natural selection: Process where favorable traits are selected, can act on an isolated population's traits.
• Gene flow: Transfer of genetic material between populations. By definition, reproductive isolation means no interbreeding with other populations, so gene flow (which requires exchange between populations) cannot occur.

Answer:

D. gene flow