Showing papers in "Theoretical Population Biology in 1983"

TL;DR: An infinite-site neutral allele model with crossing-over possible at any of an infinite number of sites is studied and the effect of intragenic recombination on the homozygosity test of Watterson and on the number of unique alleles in a sample is determined.

TL;DR: The question of selection on dispersal rates in a spatially varying, temporally constant environment is studied using an evolutionarily stable strategy approach and dispersal is modelled as passive diffusion.

TL;DR: The mean number of substitutions that will occur before the most fit allele is fixed is shown to be (formula; see text) when selection is strong and mutation is weak, independent of the parameters that went into the model.

TL;DR: A formalism for insect population dynamics is developed which covers the situation where maturation from one instar to its successor is triggered by weight gain and not by chronological age, and demonstrates the stabilizing potential of variable time delays.

TL;DR: It is shown that multigene families are evolving under continued occurrence of unequal (but homologous) crossing-over and gene conversion, and that mechanisms for maintaining genetic variability are totally different from the conventional models of population genetics.

TL;DR: A formal mathematical framework is presented for the study of linkage in man and the concept of chromosome pedigree is defined for both autosomes and X chromosomes, where all the crossover processes in the pedigree may be viewed jointly as a continuous-time Markov random walk on the vertices of a hypercube.

TL;DR: A game theoretical model is advanced to explain the emergence time schedule of male butterflies under temporal “apostatic” selection, so that males emerging on different days enjoy equal fitness in evolutionary equilibrium.

TL;DR: The stability of models of age-dependent predation in continuous time with predators exhibiting a functional response are analyzed and a number of new features of biological importance emerge that are not present in simpler models.

TL;DR: Protandry is the tendency for males to emerge before females, and it is common in insects with discrete, nonoverlapping generations in which females mate once only soon after emergence, so that protandry would be expected to evolve through sexual selection.

TL;DR: Although migration is hazardous, the model presented here shows the existence of an optimal migration strategy which implies, under certain circumstances, a positive probability of choosing migration.

TL;DR: Optimal foraging models that assume animals forage for discrete point resources on a plane and attempt to minimize their travel distance between resources do surprisingly well and more sophisticated strategies do worse if all the resource sites are visited, but do slightly better if not all the resources are visited.

TL;DR: It is proved that if the number of demes is finite and the migration matrix is arbitrary but time independent and ergodic, then in the strong-migration approximation the equilibrium and the ultimate rate and pattern of convergence of both diploid-dispersion models are close to the corresponding gametic-disPersion formulae.

TL;DR: The importance of selection at linked loci to the question of genetic differentiation in a subdivided population is discussed and the effective migration rate is seen to be small for weak selection and loose linkage in the case of adult migration.

TL;DR: A model is proposed to analyze the behavior of autosomal suppressor modifiers of "Sex-Ratio" meiotic drive in drosophila, which integrates findings from the search for modifiers and results from the measurement of fitness.

TL;DR: The variances of actual inbreeding and coancestry in terms of their corresponding identities by descent were studied for finite populations and the relationships between these components and sigma 2w, sigma2wF, and s Sigma 2bF are elaborated in termsof tight and loose linkage.

TL;DR: The model shows that sympatric speciation is possible under a wide range of quite realistic conditions, which supports the hypothesis about its possibility in nature.

TL;DR: A diffusion approximation for the single locus, single character genetic analog of the phenotypic model showed fluctuating natural selection to favor, in expectation and under suitable conditions, the allele frequency maximizing the geometric population growth rate.

TL;DR: Foraging behavior has been simulated using a model that predicts the path taken by an animal foraging for particulate food, the path being defined by the animal's remembrance of its previous foraging success.

TL;DR: A method is developed for simulating the allele frequencies in an equilibrium or transient population under the effects of neutral mutation and random drift and is fast so that it can be used to study in detail the distribution of heterozygosity or any quantity that can be expressed as a function of allele frequencies.

TL;DR: It is shown that migration between two populations in which the genotypic response to density is reversed can maintain both alleles when the intermigration rates are constant or nondecreasing functions of the population densities, and migration modification will always result in a higher equilibrium population size.

TL;DR: It is concluded that frequency dependence will often be important in determining optimal life histories, and whether optimal reproductive effort maximizes population size and whether there can be multiple alternative life histories is examined.

TL;DR: The results from the deterministic analysis can be used to predict how different factors will influence the rates of evolution in these systems.

TL;DR: Some stochastic models for the copy number of plasmids in a cell line are studied, and attention is paid to the cure rate in the cell line, and the asymptotic fractions of cells containing a given number of Plasmids.

TL;DR: The dynamic model of Taylor and Jonker, studied in detail by Zeeman, goes beyond game theory using fitness to cause evolution, perhaps towards an equilibrium, and the relation of haploid game models to constant selection in diploids is discussed.

TL;DR: The sampling theory for the infinite site model taking into account the phylogenetic relationship between the alleles is developed and a maximum likelihood estimate of theta = 4N mu can be obtained.

TL;DR: The behavior of the frequency spectrum of sites of transposable elements for the model proposed by Langley, Brookfield, and Kaplan (1983) Genetics 104 is studied when some of the sites have weak additive selection against the host.

TL;DR: It is shown that decreasing the variance of the female selection values also decreases protectedness, although this is not necessarily true for the male selection values.

TL;DR: A model of Fleming and Viot for describing frequency distributions for selectively neutral allelic populations and for multidimensional numerical genetic traits is studied, with specific attention given to two qualitative aspects that are derived: the coherence of the random wandering distribution and the tendency to cluster at microscopic scales.

TL;DR: To evaluate the genetic constitution of extranuclear or non-Mendelian genes, several formulas for the variance of linkage disequilibrium (nonrandom association of linked genes) were derived under the neutral mutation hypothesis.

TL;DR: It is found that, of all the equilibria present, there is one and only one which could possibly be stable: the existence of a unique globally stable equilibrium might then be inferred.