Relatedness

Japanese: relatedness
Relatedness

...This is evolution. For an altruistic trait to evolve, the fitness (loss) lost by helping a close relative (or relatives) divided by the increased fitness (benefit) of the close relative must be greater than the relatedness (or the coefficient of kinship). In other words, the reciprocal of the average gene sharing rate between the altruist and the beneficiary. If the loss is C , the benefit is B , and the relatedness is r , then this trait will evolve if Br - C > 0.

*Some explanations of terms that mention "relatedness" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これが進化である。利他的形質が進化するためには,近親(単数または複数)を助けるため自分が失う適応度(損失)でそれにより増えた近親者の適応度(利益)を除した値が血縁度relatedness(血縁係数でも可),すなわち利他者と受益者の平均遺伝子共有率の逆数より大きいことが必要だとされる。損失をC,利益をB,血縁度をrとすると,BrC>0ならこの形質は進化する。…

※「relatedness」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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