Final answer:
Dobzhansky-Muller Incompatibilities refer to genetic incompatibilities in hybrids that result in reduced fitness. This explains how reproductive barriers arise between closely related species.
Step-by-step explanation:
Dobzhansky-Muller Incompatibilities refer to a type of genetic incompatibility in which hybrids experience a reduction in fitness due to incompatibility of parental alleles at different loci. DMIs explain how reproductive barriers arise between closely related species but not within species.