Bridges between development and evolution

Biology and Philosophy 13 (1):119-124 (1998)
Abstract
Adaptive evolution is usually assumed to be directed by selective processes, development by instructive processes; evolution involves random genetic changes, development involves induced epigenetic changes. However, these distinctions are no longer unequivocal. Selection of genetic changes is a normal part of development in some organisms, and through the epigenetic system external factors can induce selectable heritable variations. Incorporating the effects of instructive processes into evolutionary thinking alters ideas about the way environmental changes lead to evolutionary change, and about the interplay between genetic and epigenetic systems.
Keywords acquired characters  epigenetic inheritance  induced variation  Lamarckism
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