The type of reproductive isolation in which two populations are separated due to the sperm cells of one not being able to recognize the egg cells of the other is:

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Gametic isolation occurs when the sperm cells of one species are unable to recognize or fertilize the egg cells of another species, resulting in reproductive isolation. This can lead to the formation of separate species over time. Hybrid inviability and hybrid infertility both describe different types of reproductive isolation that occur after fertilization has taken place. Temporal isolation refers to reproductive isolation arising due to differences in the timing of reproductive events between populations. Ecological isolation is a form of prezygotic isolation that occurs when two populations occupy different niches in the same geographic area, reducing opportunities for reproduction between them.

The Type of Reproductive Isolation in Which Two Populations Are