..."Over a pint of beer, the great biologist, polymath and - TopicsExpress

..."Over a pint of beer, the great biologist, polymath and pub-lover J B S Haldane was asked if he would give his life to save his drowning brother. He is supposed to have said: ‘No, but I would to save two brothers, or eight cousins.’ He was referring to one of evolution’s puzzles: why animals (including humans) help one another. Under Darwinian natural selection, shouldn’t individuals always behave selfishly in order to maximise their chances for reproduction? Starting in the 1930s, Haldane was one of the first biologists to explain altruism by what we now call ‘kin selection’. An individual who is inclined to help family members is acting selfishly, from the point of view of their genes, as they are helping to ensure the reproductive success of their shared genetic material. You share, on average, half of your genes with your brother and an eighth of your genes with your cousin, hence Haldane’s nerdy joke...."

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