‘Casanova’ genes drive evolution

Jennifer Viegas at the Australian Broadcasting Corporation News:

Sperm051104Genes that favour stronger sperm or other aspects of male sexual potency may be exerting a strong influence on human evolution, a recent study suggests.

The study determined that at least one new gene has emerged every million years on the human lineage during the past 63 million years of primate evolution.

And most of these new genes appear to be linked to male sexual prowess, the researchers write in the November issue of the journal PloS Biology.

As the new genes evolved from genes that are not directly related to male sexual function, this suggests natural selection aggressively promotes positive changes to males’ ability to reproduce.

More here.