Researchers have significantly expanded the catalogue of known human genetic variation. The resulting datasets, shared in two back-to-back publications in the journal Nature, constitute what may be ...

The new analysis traces Indian ancestry back to a migration out of Africa around 50,000 years ago, after which humans interbred with Neanderthals and Denisovans and then spread throughout Eurasia.

Some variation is the result of differences in the surroundings, or what an individual does. This is called environmental variation. Humans, dogs and goldfish are examples of species. Different ...