Neandertal DNA influences variation in skin tone and hair colour in people living today

After humans and Neandertals met many thousands of years ago, the two species began interbreeding. While Neandertals aren't around anymore, about two percent of the DNA in non-African people living today comes from them. Recent studies have shown that some of those Neandertal genes have contributed to human immunity and modern diseases. Now researchers have found that our Neandertal inheritance has contributed to other characteristics, too, including skin tone, hair colour, sleep patterns, mood, and even a person's smoking status.