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kin selection

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noun Biology.
  1. 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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for kin selection

kin selection

noun
  1. biology natural selection resulting from altruistic behaviour by animals towards members of the same species, esp their offspring or other relatives
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012