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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
kin selection
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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