Which of the following describes allopatric speciation?

Answer

A population of squirrels is separated by the Grand Canyon. Through time the two subpopulations evolve into two distinct species.

Two populations of fruit flies are unable to mate because their reproductive organs do not properly fit together.

A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid and diploid species are found in the same habitat.

One population breeds in the fall; another population breeds in the spring.

A male horse and a female donkey mate, producing a sterile ginny