What makes two species different?

Thursday, January 3, 2019 - 14:10 in Biology & Nature

For most of the 20th century, scientists believed that the reproductive incompatibility between species evolved gradually as a by-product of adapting to different environments. New research has shown there are more factors at play -- specifically the presence of 'selfish genes,' whose flow among species may dictate whether two species converge or diverge.

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