All cheetahs are nearly identical genetically, like clones, even though they don't cross-breed. In fact, the cheetah is the purest of natural animal breeds. Cheetahs are so alike genetically that any one of them will accept a skin graft from any other. This would be a good argument against evolution. |
This is not a good argument against evolution (I've never heard a good argument against evolution). If evolutionary theory didn't explain cheetahs as well as it does everything else, it wouldnt be the well tested theory we know today.
"Several examples of bottlenecks have been inferred from genetic data. For example, there is very little genetic variation in the cheetah population. This is consistant with a reduction in the size of the population to only a few individuals - an event that probably occurred several thousand years ago." Source
Such a bottleneck occured for our ancestral humans about 70,000 years ago, when the population was reduced to maybe 10-15,000 individuals.
Both these events are entirely compatible with evolutionary theory.