Analysis of Hybrid Zones
Hybrid zones are narrow regions in which genetically distinct populations meet, mate, and produce hybrids, and models of parapatric speciation, and of Wright's "shifting balance," involve the formation, move ment, and modification of hybrid zones.
A COMPARISON OF THREE INDIRECT METHODS FOR ESTIMATING AVERAGE LEVELS OF GENE FLOW
The conclusion is that, although FST and rare‐alleles methods are expected to be equally effective in analyzing ideal data, practical problems in estimating the frequencies of rare alleles in electrophoretic studies suggest that FST is likely to be more useful under realistic conditions.
Fitness Landscapes and the Origin of Species
- N. Barton
- 26 July 2004
This book builds for the first time a general, quantitative theory for the origin of species based on the notion of fitness landscapes introduced by Sewall Wright in 1932, generalizing this notion to explore the consequences of the huge dimensionality of Fitness landscapes that correspond to biological systems.
The Relative Rates of Evolution of Sex Chromosomes and Autosomes
The frequently disproportionate effects of the sex chromosomes on interspecific inviability or sterility are consistent with the hypothesis that the gene differences concerned involve recessive or partially recessive alleles fixed by selection.
A Quasi-equilibrium theory of the distribution of rare alleles in a subdivided population
The conditional average frequency can be calculated from the distribution of allele frequencies, a measure of the spread of this distribution, and so is analogous to the standardised variance, FST.
The role of hybridization in evolution
- N. Barton
- BiologyMolecular Ecology
- 1 March 2001
Fisher’s model of stabilizing selection on multiple traits, under which reproductive isolation evolves as a side‐effect of adaptation in allopatry, confirms a priori arguments that while recombinant hybrids are less fit on average, some gene combinations may be fitter than the parents, even in the parental environment.
Evolution of a Species' Range
This work studies the process using simple models that track both demography and the evolution of a quantitative trait in a population that is continuously distributed in space to dramatically shift the balance between gene flow and local adaptation, allowing a species with a limited range to suddenly expand to fill all the available habitat.
A general model for the evolution of recombination.
- N. Barton
- BiologyGenetical research
- 1 April 1995
A general representation of multilocus selection is extended to allow recombination to depend on genotype, and demonstrates a general relation between selection on recombination and observable components of fitness variation, which is open to experimental test.
Genetic analysis of hybrid zones
The aim of this chapter is to explain how data on discrete markers and on quantitative traits can be used to estimate parameters of hybrid zones and use computer simulations to show that the estimates do not depend on exactly how selection maintains the differences between the hybridizing populations.