Adaptedness and Fitness

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Abstract
Genetic homeostasis is the term used to define the condition of population equilibrium [in organisms] in which phenotypic composition is insensitive to environmental changes. In variable environments, this condition is achieved by superior adaptedness of heteozygous genotypes. The term demographic homeostasis is used to describe the ability of the birth sequence to maintain its stable trajectory when subject to environmental disturbances. This condition is characterized by the variability of the contribution of the different age classes to the stable age-distribution. This is measured by the entropy parameter. A crucial component of fitness is the speed of return of the population to the stable state when perturbed. The suggestion that entropy be used as a measure of fitness is based on 2 facts: mean entropy increases under natural selection and maximum entropy implies maximum stability.

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