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Genetic variation in organisms with sexual and asexual reproduction

Bengtsson, Bengt Olle LU (2003) In Journal of evolutionary biology 16(2). p.189-199
Abstract
The genetic variation in a partially asexual organism is investigated by two models suited for different time scales. Only selectively neutral variation is considered. Model 1 shows, by the use of a coalescence argument, that three sexually derived individuals per generation are sufficient to give a population the same pattern of allelic variation as found in fully sexually reproducing organisms. With less than one sexual event every third generation, the characteristic pattern expected for asexual organisms appear, with strong allelic divergence between the gene copies in individuals. At intermediary levels of sexuality, a complex situation reigns. The pair-wise allelic divergence under partial sexuality exceeds, however, always the... (More)
The genetic variation in a partially asexual organism is investigated by two models suited for different time scales. Only selectively neutral variation is considered. Model 1 shows, by the use of a coalescence argument, that three sexually derived individuals per generation are sufficient to give a population the same pattern of allelic variation as found in fully sexually reproducing organisms. With less than one sexual event every third generation, the characteristic pattern expected for asexual organisms appear, with strong allelic divergence between the gene copies in individuals. At intermediary levels of sexuality, a complex situation reigns. The pair-wise allelic divergence under partial sexuality exceeds, however, always the corresponding value under full sexuality. These results apply to large populations with stable reproductive systems. In a more general framework, Model 2 shows that a small number of sexual individuals per generation is sufficient to make an apparently asexual population highly genotypically variable. The time scale in terms of generations needed to produce this effect is given by the population size and the inverse of the rate of sexuality. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
allelic variation, coalescence times, genotypic, variation, selfing, partial asexuality, clonal diversity, partial sexuality
in
Journal of evolutionary biology
volume
16
issue
2
pages
189 - 199
publisher
John Wiley & Sons
external identifiers
  • pmid:14635857
  • wos:000180926300002
  • scopus:0037372666
ISSN
1420-9101
DOI
10.1046/j.1420-9101.2003.00523.x
language
English
LU publication?
yes
id
8ee2c2ec-9f75-44c8-b53c-ee4208bdbabd (old id 318221)
date added to LUP
2007-08-23 07:48:42
date last changed
2018-10-03 10:23:59
@article{8ee2c2ec-9f75-44c8-b53c-ee4208bdbabd,
  abstract     = {The genetic variation in a partially asexual organism is investigated by two models suited for different time scales. Only selectively neutral variation is considered. Model 1 shows, by the use of a coalescence argument, that three sexually derived individuals per generation are sufficient to give a population the same pattern of allelic variation as found in fully sexually reproducing organisms. With less than one sexual event every third generation, the characteristic pattern expected for asexual organisms appear, with strong allelic divergence between the gene copies in individuals. At intermediary levels of sexuality, a complex situation reigns. The pair-wise allelic divergence under partial sexuality exceeds, however, always the corresponding value under full sexuality. These results apply to large populations with stable reproductive systems. In a more general framework, Model 2 shows that a small number of sexual individuals per generation is sufficient to make an apparently asexual population highly genotypically variable. The time scale in terms of generations needed to produce this effect is given by the population size and the inverse of the rate of sexuality.},
  author       = {Bengtsson, Bengt Olle},
  issn         = {1420-9101},
  keyword      = {allelic variation,coalescence times,genotypic,variation,selfing,partial asexuality,clonal diversity,partial sexuality},
  language     = {eng},
  number       = {2},
  pages        = {189--199},
  publisher    = {John Wiley & Sons},
  series       = {Journal of evolutionary biology},
  title        = {Genetic variation in organisms with sexual and asexual reproduction},
  url          = {http://dx.doi.org/10.1046/j.1420-9101.2003.00523.x},
  volume       = {16},
  year         = {2003},
}