"Within the past 50,000 years most of the variation that is seen among human populations evolved," said researcher Jason ...

But what might humans look like in 50,000 ... possibly even hundreds—of years, Longrich said. While we do not know what the selective pressures will be like going forward, Longrich said he ...

Changes in gene frequencies because of factors like cultural preferences, geographic migration and even random events continue to shape the human genome.