To be fair, the Thraxans do appear to be mammals. They are humanoid and have mammaries, they potentially diverged from a common ancestor of humans and viltrumites. I cannot begin to justify any science behind that, but hey, can you blame Nolan for trying?
Not necessarily and probably not, the genes still have to be compatible.
Think of it like this: Ligers are a thing, but a half-breed between a human and an ape isn't. We are too far removed from our closest relatives for that to happen and viltrumites are probably in the same position (albeit they likely match a lot more species than humans would)
Edti: And to add to the hybrid parts, infertility is a big issue. Viltrumites are trying to save themselves from extinction, so mating with things that are compatible but would just be infertile afterwards isn't that high on the priority list (But they'll still do it for practical reasons if they're pushed hard enough)
Counterpoint on the gene thing, Viltrumites are genetically engineered with something called "smart atoms" that basically corrects any genetical defects.
It's part of the reason for why Viltrumite hybrids become more pure blooded the older they get: the smart atoms beocmes more efficient in preserving and enhancing that side of their bloodline.
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u/UpstateJoe Mark Grayson Mar 25 '24
If they are reptilian, they have would have a cloaca, which would not be so compatible with mammal parts.