Showing papers on "Genetic hitchhiking published in 1985"
TL;DR: A two‐locus multi‐allele sexual isolation model incorporating mutation and genetic drift which was first proposed by Nei et al. (1983) is studied here.
Abstract: A two-locus multi-allele sexual isolation model incorporating mutation and genetic drift which was first proposed by Nei et al. (1983) is studied here. One locus controls the male mating character, and the other controls female receptivity. All females are assumed to have equal mating success. Therefore, the frequencies of female receptivity alleles are changed by mutation, drift, and hitchhiking with male character alleles. Without hitchhiking, development of sexual isolation between allopatric populations proceeds faster in smaller populations, as expected. The hitchhiking effect, by triggering the mutual reinforcement of mating behavior of both sexes (or the runaway process, Fisher [1958]), speeds up the evolution of sexual isolation significantly. For populations with 2Nv ≤ 0.2 (N = population size, ν = mutation rate), the rates of divergence all approach the maximum possible rate. Sympatric sexual isolation develops quite frequently if two favorable conditions are met: 1) There is no selection on female phenotype (except in some limited cases), and 2) The population size is large enough to carry several female receptivity alleles. Because of stochastic factors, these alleles may lead to the formation of two discrete groups of females, each group receptive to males of different mating characters. The formation of sympatric sexually-isolated groups is also aided significantly, at the incipient stage, by the runaway process.
100 citations
TL;DR: It is shown that genetic drift can be a potent force for removing variation from the population when the random environment tends to occasionally push alleles down to low frequencies.
26 citations
01 Jan 1985
TL;DR: Partial inbreeding due to sibmating can reduce heterozygosity beyond that resulting from partial self-fertilization alone, and a negative autocorrelation in inbreeding over time, results in higherheterozygosity than when there is no autOCorrelation.
Abstract: Partial inbreeding due to sibmating can reduce heterozygosity beyond that resulting from partial self-fertilization alone. A negative autocorrelation in inbreeding over time, results in higher heterozygosity than when there is no autocorrelation. High selfing can result in a greater probability of polymorphism when there are selective differences over space. When two loci are considered simultaneously, inbreeding may increase or decrease the likelihood of polymorphism. Genetic hitchhiking may be basis of genetic change in highly selfed plants.
10 citations