Yoga pose on How can this be? Often, co-operative behaviour is restricted to kin other individuals who carry copies of our genes. This was only adequately explained in 1964 by William Hamilton s account of inclusive fitness. As David Buss explains, one of the significant implications of inclusive fitness theory is that we will tend to engage in what biologists call altruistic behaviour (behaviour that benefits the recipient/s at a cost to the actor) in relation to the degree of genetic relatedness between us. So, my brothers carry half of my genes. It therefore makes inclusive sense for me to sacrifice my own life to save three of them. Many social groups take advantage of this and employ kin language when referring to relationships between non-kin, e.g. Yoga pose 2016.
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