Levin's studies in Phlox showed that
A) reinforcement likely influenced mating calls in one species.
B) reinforcement likely influenced the color of flowers in one species.
C) hybrid zones become wider when the fitness of hybrids is low.
D) hybrid zones become wider when the fitness of hybrids is high.
E) habitat isolation is the most common form of reproductive isolation.

Question

Quizplus · Accepted Answer

Levin's studies in Phlox showed that reinforcement likely influenced the color of flowers in one species. Reinforcement is the process by which natural selection strengthens prezygotic barriers to reproduction between species that might otherwise be able to interbreed. In Phlox, when two different color morphs (pink and blue) were brought into contact, there was a reduction in the number of hybrids produced, indicating that natural selection reinforced the prezygotic barrier of flower color between these morphs.

Levin's Studies in Phlox Showed That