Recombination

the point where in a semiconductor minority carrier is captured in a charged point defect and recombined with subsequently captured majority carrier.

Sexual recombination only takes genes already extant and make new combinations.

Mutation presents a brand new variation ( if not neutral or deleterious ) to the eye of natural selection. So, mutation, from generation to generation.

In order to shorten the switching time, diodes sometimes are doped with gold or other deep-level impu-

rities to create more generation centers and to increase the carrier recombination rate.

Simply, the two fundamental laws are energy conservation and and momentum conservation.