منابع مشابه
Adaptive peak shifts in a heterogenous environment.
The problem of moving from one coadapted gene complex to a better one can be divided into two steps: first the advantageous combination has to appear and then it has to take over the population. Selection can have contrasting effects on the two stages. When selection is weak intermediate forms are frequent, and the advantageous combination appears easily. Spreading of that advantageous combinat...
متن کاملGene conversion may aid adaptive peak shifts.
Gene conversion is often viewed as a homogenizing force that opposes adaptive evolution. The objective of this study is to suggest a potential role for gene conversion in adaptive evolution of proteins through aiding the transfer of a population from one adaptive peak to another. Our hypothesis starts with the observation that a tandem gene duplication may result in an extra gene copy that is r...
متن کاملNon-genetic adaptive dynamics for cellular robustness
Heterogeneity in molecular expressions is non-longer seen as a nuisance. Recent works have shown that it is required for cellular diversity, in terms of variable responses and for cell fate decisions (Selvarajoo, 2012, 2013). This commentary discusses on the importance of non-genetic heterogeneity for evolutionary robustness. Darwinian Theory of natural selection, involving heritable traits and...
متن کاملGenetic signature of adaptive peak shift in threespine stickleback.
Transition of an evolving population to a new adaptive optimum is predicted to leave a signature in the distribution of effect sizes of fixed mutations. If they affect many traits (are pleiotropic), large effect mutations should contribute more when a population evolves to a farther adaptive peak than to a nearer peak. We tested this prediction in wild threespine stickleback fish (Gasterosteus ...
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ژورنال
عنوان ژورنال: Evolution
سال: 2007
ISSN: 0014-3820,1558-5646
DOI: 10.1111/j.1558-5646.2007.00166.x