A Neanderthal skull. (Image via creative commons)

Traces of Neanderthal genes have been found in humans, according to two new studies published Wednesday. The studies found that the genes are particularly evident in East Asian and European populations.

Some theorize that the Neanderthal DNA could have provided further insulation to the colder climates as humans migrated from Africa.

One study suggests that because Neanderthal DNA was not found in genes affecting testicles or the X chromosome, it is possible that early sexual contact between humans and Neanderthals led to decreased male fertility in humans. Eventually, natural selection and evolution may have then diminished the presence of Neanderthal DNA. 

Read the two studies here and here. Contact Executive Producer Raishad Hardnett here.