منابع مشابه
Phenotypic evolution and parthenogenesis
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متن کاملEvolution and comparative ecology of parthenogenesis in haplodiploid arthropods
Changes from sexual reproduction to female-producing parthenogenesis (thelytoky) have great evolutionary and ecological consequences, but how many times parthenogenesis evolved in different animal taxa is unknown. We present the first exhaustive database covering 765 cases of parthenogenesis in haplodiploid (arrhenotokous) arthropods, and estimate frequencies of parthenogenesis in different tax...
متن کاملThe evolution of geographic parthenogenesis in Timema walking-sticks.
Phylogenetic studies of asexual lineages and their sexual progenitors are useful for inferring the causes of geographical parthenogenesis and testing hypotheses regarding the evolution of sex. With five known parthenogens and well-studied ecology, Timema walking-sticks are a useful system for studying these questions. Timema are mainly endemic to California and they exhibit the common pattern o...
متن کاملPhenotypic plasticity and experimental evolution.
Natural or artificial selection that favors higher values of a particular trait within a given population should engender an evolutionary response that increases the mean value of the trait. For this prediction to hold, the phenotypic variance of the trait must be caused in part by additive effects of alleles segregating in the population, and also the trait must not be too strongly genetically...
متن کاملEvolution 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...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1983
ISSN: 0003-0147,1537-5323
DOI: 10.1086/284169