- Apr 29, 2010
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Cheetahs. Fastest land animal, symbol of the African Savannah, product of extreme incest.
Let's back up a bit.
Cheetahs have extremely minuscule genetic diversity. You can perform skin grafts between two Cheetahs with virtually no fear of rejection. It's as if they were all very closely related - indeed, there's virtually no difference between an inbred cheetah and a cheetah with unrelated parents. Their genetic variability is almost non-existent. This is not a good thing - it leads to massive infant mortality rates, high morbidity rates from diseases, and many other serious problems.
This genetic diversity was caused by a population bottleneck some 10,000 years ago. The Cheetah species almost went extinct, but bounced back. However, this "bounce back" took a massive toll on the genetic diversity of the species, as the ended up horribly inbred with almost no diversity to speak of.
So here's the problem.
If almost every mammalian species on earth was culled down to 2 members a mere 4000 years ago, why does only the Cheetah (and the southern elephant seal, and a handful of others) show this sort of lack of diversity? Why does one population seem entirely inbred, while another shows the sort of genetic diversity which, according to everything we know about evolution and the conservation rates of certain parts of the genome, should be blatantly impossible from 2 individuals in 4000 years?
Relevant video:
Let's back up a bit.
Cheetahs have extremely minuscule genetic diversity. You can perform skin grafts between two Cheetahs with virtually no fear of rejection. It's as if they were all very closely related - indeed, there's virtually no difference between an inbred cheetah and a cheetah with unrelated parents. Their genetic variability is almost non-existent. This is not a good thing - it leads to massive infant mortality rates, high morbidity rates from diseases, and many other serious problems.
This genetic diversity was caused by a population bottleneck some 10,000 years ago. The Cheetah species almost went extinct, but bounced back. However, this "bounce back" took a massive toll on the genetic diversity of the species, as the ended up horribly inbred with almost no diversity to speak of.
So here's the problem.
If almost every mammalian species on earth was culled down to 2 members a mere 4000 years ago, why does only the Cheetah (and the southern elephant seal, and a handful of others) show this sort of lack of diversity? Why does one population seem entirely inbred, while another shows the sort of genetic diversity which, according to everything we know about evolution and the conservation rates of certain parts of the genome, should be blatantly impossible from 2 individuals in 4000 years?
Relevant video: