‘Casanova’ genes drive evolution

Genes that favour stronger sperm or other aspects of male sexual potency may be exerting a strong influence on human evolution, suggests a recent study.

Most of the new genes that have emerged on the human lineage during the past 63 million years of primate evolution appear to be linked to male sexual prowess.

The new genes evolved from genes that are not directly related to male sexual function, suggesting natural selection promotes positive changes to males’ ability to reproduce.