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But not every species is fortunate enough to have a rich and varied gene pool.For instance, a catastrophic event like an earthquake or rapid climate change might wipe out the majority of a species, leaving only a few genetically similar members to carry on.Anyone who's taken biology has heard the phrase "survival of the fittest." To the relief of couch potatoes everywhere, the phrase doesn't refer to physical fitness but rather to evolutionary fitness.As a population of a given species reproduces, certain variants of a gene, known as alleles, can become more prevalent in that population as those alleles prove advantageous for survival.

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At present, documented populations occur in Algeria, sub-Saharan Africa, Iran, and isolated oases in the Qattara Depression in Egypt.

This was a time when all the Pleistocene megafauna went extinct, including sabretooths, mammoths and the woolly rhino.

Related: Genome sequencing in babies to begin as part of study The second bottleneck came around 10,000-12,000 years ago, further reducing its numbers and causing a major reduction in the gene pool that remains today.

“It allows you to say wow, there was an event that probably was a brush with extinction – I mean the tigers had one about 75,000 years ago when there was an eruption of some volcano in Southeast Asia.” To understand its evolutionary history, researchers that also included members of the Beijing Genomics Institute and the Cheetah Conservation Fund (CCF) sequenced the genome from a male Namibian cheetah named 'Chewbaaka', and six other wild cheetahs from Tanzania and Namibia. The variation in the cheetah genome is far below that observed in inbred dogs and cats, with researchers showing that the cheetah has lost 90-99 percent of the genetic variation typically seen in outbred mammals.

“The cheetahs themselves look as if they were deliberately inbred because the amount of variation they have overall throughout the entire genome is really off the scale as far as being lower than anything else we have ever seen,” O’Brien said.

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