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Adaptation or exaptation The case of the human hand.
J Biosci ; 2011 Sep; 36 (4): 575-585
Artículo en Inglés | IMSEAR | ID: sea-161578
ABSTRACT
A controversy of relevance to the study of biological form involves the concept of adaptation. This controversy is illustrated by the structure and function of the human hand. A review of the principal definitions of adaptation points to two main problems (1) they are qualitative and make reference to the whole structure (or substructural feature) and (2) they are based on the idea of natural selection as a moulding factor. The first problem would be solved by a definition that encompasses quantitative measures of the effects of selection, drawing on new advances in the comparative method. The second problem is deeper and presents greater conceptual difficulties. I will argue that the idea of natural selection as a moulding factor depends on the notion of a genetic program for development. But regarding the hand, experimental evidence on limb development challenges the idea of a genetic program for skeletal pattern formation, undermining a simple application of standard adaptationist concepts. These considerations lead to a revised definition of adaptation and interpretation of the evolutionary determinants of the hand’s form.

Texto completo: Disponible Índice: IMSEAR (Asia Sudoriental) Tipo de estudio: Investigación cualitativa Idioma: Inglés Revista: J Biosci Año: 2011 Tipo del documento: Artículo

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Texto completo: Disponible Índice: IMSEAR (Asia Sudoriental) Tipo de estudio: Investigación cualitativa Idioma: Inglés Revista: J Biosci Año: 2011 Tipo del documento: Artículo