It’s been known for several years from studies on twins that altruistic behavior is partly influenced by genes. Altruism was known to be from 30–50% heritable in humans in both Western and non-Western populations. In a word, there is evidence that altruism is partly motivated by genetics. Researchers in the Department of Clinical Medicine, Næstved Hospital, Denmark studied altruism in blood donations. Using mathematical models, they determined that 50% of altruistic motivation is due to genes, 30% to a shared environment, and 20% to other factors. Individuals still have a choice whether to be to be kind and altruistic—or not.
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