Nicholas Barton
Nicholas H
Barton0000-0002-8548-5240
Rouhani, Shahin
Shahin
Rouhani
The probability of fixation of a new karyotype in a continuous population
Wiley-Blackwell
1991
2018-12-11T12:04:25Z
2019-04-26T07:22:32Z
journal_article
https://research-explorer.app.ist.ac.at/record/3648
https://research-explorer.app.ist.ac.at/record/3648.json
We investigate the probability of fixation of a chromosome rearrangement in a subdivided population, concentrating on the limit where migration is so large relative to selection (m ≫ s) that the population can be thought of as being continuously distributed. We study two demes, and one- and two-dimensional populations. For two demes, the probability of fixation in the limit of high migration approximates that of a population with twice the size of a single deme: migration therefore greatly reduces the fixation probability. However, this behavior does not extend to a large array of demes. Then, the fixation probability depends primarily on neighborhood size (Nb), and may be appreciable even with strong selection and free gene flow (≈exp(-B·Nb) in one dimension, ≈exp(-B\cdotNb) in two dimensions). Our results are close to those for the more tractable case of a polygenic character under disruptive selection.