Divisive gene splits brain and brawn

CARDIFF U. (UK) — A newly discovered gene defies conventional rules, with the copies inherited from the mother and father working in different ways.

In most cases, both copies are active, but in some one copy is switched off, a process called imprinting.
A gene called Grb10 takes things a step further with the copy from the father only active in the brain and the maternal copy active in all other parts of the body.