G2TT
来源类型Article
规范类型其他
DOI10.1006/tpbi.2001.1563
Additive genetic variation under intraspecific competition and stabilizing selection: A two-locus study.
Buerger R
发表日期2002
出处Theoretical Population Biology 61 (2): 197-213
出版年2002
语种英语
摘要A diallelic two-locus model is investigated in which the loci determine the genotypic value of a quantitative trait additively. Fitness has two components: stabilizing selection on the trait and a frequency-dependent component, as induced, for instance, if the ability to utilize different food resources depends on this trait. Since intraspecific competition induces disruptive selection, this model leads to a conflict of selective forces. We study how the underlying genetics (recombination rate and allelic effects) interacts with the selective forces, and explore the resulting equilibrium structure. For the special case of equal effects, global stability results are proved. Unless the locus effects are sufficiently different, the genetic variance maintained at equilibrium displays a threshold-like dependence on the strength of competition. For loci with equal effects, the equilibrium fitnesses of genotypic values exhibit disruptive selection if and only if competition is strong enough to maintain a stable two-locus polymorphism. For unequal effects, disruptive selection can be observed for weaker competition and in the absence of a stable polymorphism.
主题Adaptive Dynamics Network (ADN)
关键词Quantitative genetics Genetic variance Stable polymorphism Stabilizing selection Disruptive selection Intraspecific competition Two-locus model Recombination
URLhttp://pure.iiasa.ac.at/id/eprint/6604/
来源智库International Institute for Applied Systems Analysis (Austria)
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资源类型智库出版物
条目标识符http://119.78.100.153/handle/2XGU8XDN/128152
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Buerger R. Additive genetic variation under intraspecific competition and stabilizing selection: A two-locus study.. 2002.
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