The Selfish Gene

Wed, 31 Dec 1969 19:32:56 -0500

Summary

Dawkins argues that the fundamental unit of natural selection is at a gene level. He then continues to build the world from single genes into what we see today, explaining why many different behaviors that are confusing at first, when examined from the “gene’s eye view” they start to make sense. If you have heard of Darwin, then odds are you’ve heard the phrase “survival of the fittest”, but the question that this statement raises is, survival of what? The fittest claw? The fittest lion? The fittest pride? The fittest species? Dawkins makes the case that what is surviving is the gene and for this to work he defines gene slightly different than a geneticist would. He says a gene is the smallest single or collection of chromosomal material that lasts enough generations to act as a unit of natural selection. An easily understandable example would be the gene for blue eyes. On the face of it this definition seems circular, by definition he can’t be wrong. Genes — segments of chromosomal material — are the smallest trait-carrying units we know of, so if natural selection exists, it must start there. One might be tempted to ask why he didn’t define genes as a group or single quark that exists together long enough to be a unit of natural selection, but he spends a fair bit of time expanding this definition into less of a tautology and more of a theory. One interesting question the comes up is if natural selection is at the gene level and logically therefore all genes are acting selfishly (anthropomorphizing to help us think about the situation), then why would they band together with competing genes to form flesh suits, or elm trees? To answer this he brings in the concepts of replicators and vehicles. Another term he uses throughout the book was survival machines, this was a clever choice as it applies to anything that is alive, plants, animals, etc. Dawkins says that genes are the replicators and survival machines are their vehicles. So since we are already anthropomorphizing, I don’t think it would be too much of a stretch to picture a chromosome behind the wheel of a car on a speeding highway trying not to die, the car in this case would anything from single celled amoeba, to a giraffe. When we come back to reality of course this does not work in this way, as a single gene has next to no control over where a bat is going, or over the next word I type. But Dawkins chooses to zoom in on the “next to nothing” influence, because if you put enough next to nothings together, you just might have something!

Richard_dawkins on George's Blog

The Selfish Gene