PsychoSarah
Chaotic Neutral
The loss in variability was a result of the drastically reduced population. The more genetically diverse species that the cheetah descended from was a larger population of cheetahs.
The "ark" is a story. It didn't happen. You might just as well claim that superman reduced genetic variability with his x-ray vision.
If each species had all descended from just two individuals, we would find very low genetic variability in all species, even lower than in the cheetah.
The date is an estimate, based on known rates of mutation.
There is more genetic variability in sub-Saharan humans than there is in all the rest of the human species. Since all non-African humans are descended from small original populations that moved out of Africa, there is less variation in the emigrants than in the base population.
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