منابع مشابه
Evolution of Phenotypic Variance.
A cornerstone of evolutionary theory is that the phenotypic variance of a population may be partitioned into genetic and environmental (nonheritable) components. The traditional motivation for this distinction is that the rate of evolution under natural selection depends on the (relative) magnitudes of certain genetic components of variance. The components of variation are also interesting from...
متن کاملPhenotypic divergence along lines of genetic variance.
Natural populations inhabiting the same environment often independently evolve the same phenotype. Is this replicated evolution a result of genetic constraints imposed by patterns of genetic covariation? We looked for associations between directions of morphological divergence and the orientation of the genetic variance-covariance matrix (G) by using an experimental system of morphological evol...
متن کاملThe phenotypic variance gradient – a novel concept
Evolutionary ecologists commonly use reaction norms, which show the range of phenotypes produced by a set of genotypes exposed to different environments, to quantify the degree of phenotypic variance and the magnitude of plasticity of morphometric and life-history traits. Significant differences among the values of the slopes of the reaction norms are interpreted as significant differences in p...
متن کاملVariance Morphology and Evolution
The lifetimes of chromospheric active regions and active region complexes (\active longitudes") for 35 lower main sequence stars observed at Mount Wilson Observatory are estimated from the relative distribution of pooled variance at diierent time scales. The time scale of active region evolution (i.e., the lifetime of large active regions) is approximately 50 days, while the lifetime of active ...
متن کاملPhenotypic evolution and parthenogenesis
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ژورنال
عنوان ژورنال: Evolution
سال: 1987
ISSN: 0014-3820,1558-5646
DOI: 10.1111/j.1558-5646.1987.tb05799.x