Since all humans have a common ancestor, only a tiny subset of variations varies significantly in frequency between groups. In single nucleotide polymorphisms in humans, genome diversity occurs.
When a species' nucleotide diversity is greater than 5%, it is said to be genetically hyperdiverse. Nucleotide diversities in most plants and animals are less than that quantity. Humans, by way of comparison, have a nucleotide diversity of roughly 0.1%, according to Cutter.
Evolutionary geneticists have now demonstrated that during two severe bottlenecks that occurred between 60,000 and 50,000 years ago as modern humans left Africa, a significant portion of our ancestors' genetic variation was lost.
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