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THE PROBABILITY OF FIXATION OF A NEW KARYOTYPE IN A CONTINUOUS POPULATION.
- Source :
-
Evolution; international journal of organic evolution [Evolution] 1991 May; Vol. 45 (3), pp. 499-517. - Publication Year :
- 1991
-
Abstract
- 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√s) in one dimension, ≈exp(-B ≈ Nb) in two dimensions). Our results are close to those for the more tractable case of a polygenic character under disruptive selection.<br /> (© 1991 The Society for the Study of Evolution.)
Details
- Language :
- English
- ISSN :
- 1558-5646
- Volume :
- 45
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Evolution; international journal of organic evolution
- Publication Type :
- Academic Journal
- Accession number :
- 28568824
- Full Text :
- https://doi.org/10.1111/j.1558-5646.1991.tb04326.x