Natural and Sexual Selection

Phenotypic differences in genetically identicalorganisms: the epigenetic perspective

Tue, 15 Jan 2013 12:57:24 GMT

Phenotypic differences in genetically identicalorganisms: the epigenetic perspective
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Created by: ruiseixas

The web of human sexual contacts

Wed, 25 May 2011 21:25:49 GMT

The web of human sexual contacts
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Created by: ruiseixas

Are eukaryotic microorganisms clonal or sexual? A populationgenetics vantage

Sat, 18 Dec 2010 18:31:27 GMT

Are eukaryotic microorganisms clonal or sexual? A populationgenetics vantage
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Created by: ruiseixas

Bangiomorpha pubescens

Sat, 18 Dec 2010 17:56:52 GMT

Bangiomorpha pubescens
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Ring Species another Illusionist Trick

Tue, 23 Nov 2010 10:12:57 GMT

Ring Species another Illusionist Trick
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Created by: ruiseixas

The Truth about Species!

Tue, 23 Nov 2010 10:11:07 GMT

The Truth about Species!
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Sex reduces genetic variation: a multidisciplinary review

Sat, 20 Nov 2010 00:00:00 GMT

Sex reduces genetic variation: a multidisciplinary review
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The Relationship between Maternal Age and Chromosome Size in Autosomal Trisomy

Sun, 31 Oct 2010 20:00:13 GMT

The Relationship between Maternal Age and Chromosome Size in Autosomal Trisomy
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An Open Letter about Natural and Sexual Selection

Thu, 29 Jul 2010 00:00:00 GMT

An Open Letter about Natural and Sexual Selection
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On the Origin of Species by Natural and Sexual Selection

Fri, 18 Dec 2009 00:00:00 GMT

Ecological speciation is considered an adaptive response to selection for local adaptation. However, besides suitable ecological conditions, the process requires assortative mating to protect the nascent species from homogenization by gene flow. By means of a simple model, we demonstrate that disruptive ecological selection favors the evolution of sexual preferences for ornaments that signal local adaptation. Such preferences induce assortative mating with respect to ecological characters and enhance the strength of disruptive selection. Natural and sexual selection thus work in concert to achieve local adaptation and reproductive isolation, even in the presence of substantial gene flow. The resulting speciation process ensues without the divergence of mating preferences, avoiding problems that have plagued previous models of speciation by sexual selection.

Extremely High Mutation Rate of a Hammerhead Viroid

Fri, 06 Mar 2009 00:00:00 GMT

Extremely High Mutation Rate of a Hammerhead Viroid
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Evolution of mutation rates in bacteria

Fri, 24 Mar 2006 00:00:00 GMT

Evolutionary success of bacteria relies on the constant fine-tuning of their mutation rates, which optimizes their adaptability to constantly changing environmental conditions. When adaptation is limited by the mutation supply rate, under some conditions, natural selection favours increased mutation rates by acting on allelic variation of the genetic systems that control fidelity of DNA replication and repair. Mutator alleles are carried to high frequency through hitchhiking with the adaptive mutations they generate. However, when fitness gain no longer counterbalances the fitness loss due to continuous generation of deleterious mutations, natural selection favours reduction of mutation rates. Selection and counterselection of high mutation rates depends on many factors: the number of mutations required for adaptation, the strength of mutator alleles, bacterial population size, competition with other strains, migration, and spatial and temporal environmental heterogeneity.