Biology / Bio 1769 · Atom · ~20 seconds
Fitness and Relative Fitness
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Fitness is an individual's genetic contribution to the next generation; relative fitness compares that against others in the same population, not any absolute standard.
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An individual whose offspring survive and reproduce better than the population average has higher relative fitness, whatever its absolute output.
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Relative fitness is comparative within one population — the same individual could have a different value elsewhere.