Is Kin Selection Dead?


None other that E.O. Wilson, father of Sociobiology, and one of the greatest minds in Biology of the last half-century says that it’s time to dump the idea of kin selection:

"We hope our new theory for the evolution of eusociality will open up sociobiology to new avenues of research by liberating the study of social evolution from mandatory adherence to kin selection theory. After four decades ruling the roost, it is time to recognise this theory’s very limited prowess."

Kin Selection, as defined by John Maynard Smith (the great mathematical biologist, and likely the inventor of the term) is:

By kin selection I mean the evolution of characteristics which favour the survival of close relatives of the affected individual, by processes which do not require any discontinuities in the population breeding structure.

Say what?

This is a better one:

It seeks to explain why individuals take the seemingly paradoxical step of sacrificing their own reproductive potential in order to care for the offspring of relatives.

OK, think of ants. Worker ants will do all kinds of crazy stuff that results in their death in order to increase the likelyhood that the queen ants can continue to breed.  This SEEMS like a bad idea on the part of the worker ant, since from his own perspective … he’s dead.

The idea, then, has been that over time, the genes of the species evolved in such a way as to cause certain members of the same family-line to sacrifice themselves so that others can breed.  Since they are kin, they share a large portion of their genomes, and therefore it is believed that the sacrifice isn’t actually all that crazy, since the sister will be passing on what basically amounts to YOUR genes.

Kin selection has been the dominant method of explaining the eusociality of hierarchical species such as ants, bees, and even wolves and humans.

What’s amazing here is that Wilson has been a long-time backer of kin selection theory.   So, to see him pull back is something interesting. I’m not sure if I agree with him yet. But, he ain’t no dummy.


One response to “Is Kin Selection Dead?

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