Exogamy has two related definitions, both biological and cultural. Biological Exogamy In Biology, exogamy more generally refers to the mating of individuals who are relatively less related genetically, that's outbreeding as opposed to inbreeding, this benefits the offspring by avoiding the chance of the offspring inheriting two copies of a defective gene and also by increasing the genetic diversity of the offspring, improving the chances that more of the offspring will have the required adapta… (More on Exogamy)