Ability to passed the individual characters between generations that is responsible for the resemblances between parents and offspring.Natural selection is effective, and the biological evolution can operate, only if individual differences between organisms are hereditary.Various degrees of heritability of properties can exist; in some systems, a characteristic property of a certain individual can be passed on to its progeny in unaltered form and degree, at other times to a lesser degree or may appear in progeny only with increased probability.

Amongst modern organisms, heredity is based on copying genetic information, instructions for creation of the body of organisms. Theoretically, completely different mechanisms could also exist, based, for example, on direct copying of the actual structure of the organism itself.

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The classical Darwinian theory of evolution can explain the evolution of adaptive traits only in asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in both asexual and sexual organisms Read more