One method of protecting the genetic identity of a population is the inability of sperm to fertilize eggs of a different species.This isolating mechanism is called:

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Gametic isolation is the isolation mechanism in which the gametes of different species are incompatible, and the sperm of one species cannot fertilize the eggs of another species. Thus, this mechanism prevents the formation of hybrids and protects the genetic identity of the population. Behavioral isolation is the mechanism in which differences in behavior, such as mating rituals, prevent mating between different species. Ecological isolation is the mechanism in which two species occupy the same geographical area, but they live in different habitats and rarely encounter each other. Temporal isolation is the mechanism in which two species breed at different times, such as different seasons or times of day.

One Method of Protecting the Genetic Identity of a Population