Question

reproductive barriers occur when two organisms are prevented from mating. what type of reproductive barrier occurs when a sperm cell cannot enter an egg cell?
gametic isolation
gcographic isolation
temporal isolation

Explanation:

Gametic isolation is a pre - zygotic reproductive barrier where sperm and egg cells (gametes) of different species are incompatible. Geographic isolation is about physical separation of populations. Temporal isolation is related to differences in mating times. Here, the problem is about sperm - egg incompatibility.

Answer:

gametic isolation