“new paper just published suggests that a major bottleneck in our evolutionary history happened between 930,000 and 800,000 years ago, and points to the chromosome 2 fusion as one possible consequence”

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Link. Speciation event?

“evidence that the chromosomes had fused in the common ancestors of ancestral African, Neandertal, and Denisovan populations, but also that the ancestral 2b centromere had already evolved into its humanlike nonfunctional form before these hominins diverged.”