The spread of recessive biological traits via sexual selection.

[Lul Thyme]

In any case, how would this theory explain the same phenomena happening in the rest of the non-human living world?

Heck, even in the human world, anything depending on "nobility" is probably too slow to explain these kinds of phenomena.

[DaShi]

Recessive traits are much harder to remove from a population becuase the buggers can hide.