Kin selection
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Kin selection is a process whereby natural selection favours a trait due to its positive effects on the reproductive success of an organism's relatives, even when at a cost to the organism's own survi
The co-operative behaviour of social insects like the honey bee can be explained by kin selection.
Charles Darwin wrote that selection could be applied to the family as well as to the individual.
The evolutionary biologist John Maynard Smith used the term "kin selection" in 1964.
Kin recognition theory predicts a selective advantage for the bearers of a trait (like the fictitious 'green beard') behave altruistically towards others with the same trait.
Fitness (biology)
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Fitness is a quantitative representation of what tends to be favored by natural selection. Fitness can be defined either with respect to a genotype or to a phenotype in a given environment or time. Th
Herbert Spencer
Darwin's finches by Gould
Selective sweep, frequency vs time