منابع مشابه
Natural and sexual selection against hybrid flycatchers.
While sexual selection is generally assumed to quickly cause or strengthen prezygotic barriers between sister species, its role in causing postzygotic isolation, through the unattractiveness of intermediate hybrids, is less often examined. Combining 24 years of pedigree data and recently developed species-specific molecular markers from collared (Ficedula albicollis) and pied (Ficedula hypoleuc...
متن کاملNatural and sexual selection on many loci.
A method is developed that describes the effects on an arbitrary number of autosomal loci of selection on haploid and diploid stages, of nonrandom mating between haploid individuals, and of recombination. We provide exact recursions for the dynamics of allele frequencies and linkage disequilibria (nonrandom associations of alleles across loci). When selection is weak relative to recombination, ...
متن کاملGenePool: Exploring The Interaction Between Natural Selection and Sexual Selection
Gene Pool is an artificial life simulation designed to bring some basic principles of evolution to light in an entertaining and instructive way. Most significant is the aspect of sexual selection — where mate choice is a factor in the evolution of morphology and motor-control in physically-based animated organisms. We see in the examples of deer antlers, peacock tails, and fish coloration a mag...
متن کاملSexual dichromatism in frogs: natural selection, sexual selection and unexpected diversity.
Sexual dichromatism, a form of sexual dimorphism in which males and females differ in colour, is widespread in animals but has been predominantly studied in birds, fishes and butterflies. Moreover, although there are several proposed evolutionary mechanisms for sexual dichromatism in vertebrates, few studies have examined this phenomenon outside the context of sexual selection. Here, we describ...
متن کاملCanine Evolution in Sabretoothed Carnivores: Natural Selection or Sexual Selection?
The remarkable elongated upper canines of extinct sabretoothed carnivorous mammals have been the subject of considerable speculation on their adaptive function, but the absence of living analogues prevents any direct inference about their evolution. We analysed scaling relationships of the upper canines of 20 sabretoothed feliform carnivores (Nimravidae, Barbourofelidae, Machairodontinae), repr...
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ژورنال
عنوان ژورنال: Evolution
سال: 1989
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1989.tb02585.x