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Gene flow and the geographic structure of natural populations / Montgomery Slatkin in Science, vol. 236, n°4803 (Année 1987)

Public [article]  inScience > vol. 236, n°4803 (Année 1987) . - pp. 787-92 Titre : Gene flow and the geographic structure of natural populations Auteurs : Montgomery Slatkin, Auteur Année de publication : 1987 Article en page(s) : pp. 787-92 Langues : Anglais (eng) Mots-clés : différenciation génétique  facteur génétique  flux de gènes  diversité génétique  variation génétique géographique Résumé : "There is abundant geographic variation in both morphology and gene frequency in most species. The extent of geographic variation results from a balance of forces tending to produce local genetic differentiation and forces tending to produce genetic homogeneity. Mutation, genetic drift due to finite population size, and natural selection favoring adaptations to local environmental conditions will all lead to the genetic differentiation of local populations, and the movement of gametes, individuals, and even entire populations--collectively called gene flow--will oppose that differentiation. Gene flow may either constrain evolution by preventing adaptation to local conditions or promote evolution by spreading new genes and combinations of genes throughout a species' range. Several methods are available for estimating the amount of gene flow. Direct methods monitor ongoing gene flow, and indirect methods use spatial distributions of gene frequencies to infer past gene flow. Applications of these methods show that species differ widely in the gene flow that they experience. Of particular interest are those species for which direct methods indicate little current gene flow but indirect methods indicate much higher levels of gene flow in the recent past. Such species probably have undergone large-scale demographic changes relatively frequently. " (source : auteur) Type de publication : périodique Référence biblio : Slatkin M., 1987 - Gene flow and the geographic structure of natural populations. Science, 236 (4803) : 787-92. ID PMB : 72261 DOI : 10.1126/science.3576198 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72261 [article]

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