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Carte Evolution in the Dark Horst Wilkens

Evolution in the Dark

Darwin's Loss Without Selection

Autor: Horst Wilkens, Ulrike Strecker
Limbă: engleză
Legare: Carte broșată
Editura: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Disponibilitate: șansă 50%
Şanse de a obține acest titlu
861.35 lei
This book provides fascinating insights into the development and genetics of evolutionary processes...

Informații despre carte

Autor
Horst Wilkens, Ulrike Strecker
Limbă
engleză
Legare
Carte - Carte broșată
Publicat
2018
Pagini
217
EAN
9783662572016
Enbook ID
20119755
Editura
Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Greutate
3933
Dimensiuni
155 x 235

Descriere completă

This book provides fascinating insights into the development and genetics of evolutionary processes on the basis of animals living in the dark, such as the Astyanax cave fish. Biologically functionless traits show high variability, which results from neutral deleterious mutations no longer being eliminated by natural selection, which normally acts to preserve functional capability. These negative mutations accumulate until the traits they are responsible for become rudimentary or even lost. The random genetic basis of regressive evolution is in accordance with Nei's Neutral Theory of Molecular Evolution , which applies to the molecular level. Such processes are particularly conspicuous in species living in constant darkness, where, for example in Astyanax , all traits depending on the exposure to light, like eyes, pigmentation, visually triggered aggressive behaviour, negative phototaxis, and several peripheral outcomes of circadian rhythmicity, are useless and diminish. In compensation constructive traits like taste, olfaction or the lateral line senses are improved by selection and do not show variability. Regressive and constructive traits inherit independently, proving that the rudimentation process is not driven by pleiotropic linkage between them. All these traits are subject to mosaic evolution and exhibit unproportional epistatic gene effects, which play an important role in evolutionary adaptation and improvement. Offering valuable evolutionary insights and supplemented by a wealth of illustrations, this book will appeal to evolutionary and developmental biologists alike.

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