Non-programmed (Nonadaptive) Aging Theories
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Non-programmed or nonadaptive aging theories refer to explanations of aging that do not hypothesize an adaptive meaning for this phenomenon. For non-programmed theories, aging is seen as a set of degenerative phenomena that natural selection cannot contrast completely due to its insufficient strength or to opposing selective pressures.
Many non-programmed aging theories have been suggested, and this entry presents a general exposition of the main characteristics of the most convincing ones. Many of the earliest theories explained aging by taking into account only a restricted number of biological processes and without including any evolutionary mechanism. As a result, they were not able to explain the highly diverse types of mortality curves encountered within the tree of life (“Life Tables”). Nevertheless, when analyzing, from a systemic perspective, the biological processes related to aging (“Aging...
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