kin selection

noun Biology.
a form of natural selection that favors altruistic behavior toward close relatives resulting in an increase in the altruistic individual's genetic contribution to the next generation.
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kin selection
 
n
biology natural selection resulting from altruistic behaviour by animals towards members of the same species, esp their offspring or other relatives

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Perhaps the biggest change that group selection brings to evolutionary theory is its implication for so-called kin selection.
Reciprocal altruism and kin selection are the two main theories.
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