Rocky Mountain juniper (Juniperus scopulorum)and one-seeded juniper (J. monosperma)have overlapping ranges. If pollen grains (which contain sperm cells)from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells)of the other species, then which of these terms is applicable?

Question

Quizplus · Accepted Answer

Mechanical isolation refers to physical or structural differences in reproductive organs or structures that prevent mating or fertilization between species. In this case, pollen grains from one species are unable to make pollen tubes on female ovules of the other species, suggesting a physical barrier to fertilization, which fits the definition of mechanical isolation.

Rocky Mountain Juniper (Juniperus Scopulorum)and One-Seeded Juniper (J