[Luke Skyfreeper]

Within modern humans, a group of closely related haplotypes at this locus, known as haplogroup D, rose from a single copy 37,000 years ago and swept to exceptionally high frequency (70% worldwide today) because of positive selection.

So it sounds like 70% of us are descended from a single common ancestor who lived 37,000 years ago?

[Strategerist]

Haplogroup D is Japanese, Tibetans, Tajiks, and Andaman Islanders.

[edsheppa]

So it sounds like 70% of us are descended from a single common ancestor who lived 37,000 years ago?

Not necessarily. The proposed interbreeding might have been more general.