What makes two species different? The role of selfish genes in distinguishing a species 

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.

Source: What makes two species different? The role of selfish genes in distinguishing a species — ScienceDaily

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