As a real-world biologist, my guess would be that inter-racial breeding would be like the typical hybridization you see in the real world examples of tigons, ligers, mules, etc. In all likelihood, an inter-racial hybrid would be sterile. The potential parents of such a creature, or at least the mother, would likely consider this when it comes to producing children and abstain from inter-racial breeding.
As for inter-breeding between the two different clans within a species, it should be completely biologically viable. Only social stigma and cultural bias would make it unlikely. Even these would make it so that inter-breeding is uncommon rather than extremely rare, depending on the species. Miqo'te I would expect to have very little inter-breeding because their mating structures are very different, and they are diurnal versus nocturnal. The other races like Hyur and Lalafell probably interact regularly within their two clans.
As for inter-breeding between the two different clans within a species, it should be completely biologically viable. Only social stigma and cultural bias would make it unlikely. Even these would make it so that inter-breeding is uncommon rather than extremely rare, depending on the species. Miqo'te I would expect to have very little inter-breeding because their mating structures are very different, and they are diurnal versus nocturnal. The other races like Hyur and Lalafell probably interact regularly within their two clans.
I'm a tinker! Tinkerer? Hrm.... I'm an artificer! - Myxie Tryxle | Impressions and Memories
