Although horses and donkeys can interbreed, the resulting mule offspring are infertile. Genetic incompatibility that develops post-zygotically is one type of reproductive isolation mechanism.
A group of behavioral patterns, physiological processes, and evolutionary mechanisms that are essential for speciation make up the mechanisms of reproductive isolation. They either ensure that any kids are sterile or stop members of different species from having children.
Oftentimes, closely related species hybrids perish or, if they do survive, are infertile. This hybrid sterility and inviability, also known as hybrid incompatibility, may impede the exchange of genetic variants among species.
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