IPA: /ˌhɛtəˈrɒɡəmi/
KK: /hɛtəˈrɒɡəmi/
The condition in which two different types of gametes, or reproductive cells, come together to create offspring, often differing in size and structure.
Heterogamy is important in many species for promoting genetic diversity.
Heterogamy → It is formed from "hetero-" (from Greek "heteros", meaning different) and "gamy" (from Greek "gamos", meaning marriage or union). The word refers to a type of marriage or union that occurs between individuals of different types or species.
Think of 'different' ('hetero-') coming together in 'marriage' ('gamy') — that's what heterogamy means.