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DERIVA GENETICA, DISTANZE GENETICHE E DISTANZE GEOGRAFICHE

ITALO BARRAI
Genus
Vol. 35, No. 3/4 (1979), pp. 41-50
Stable URL: http://www.jstor.org/stable/29788246
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
DERIVA GENETICA, DISTANZE GENETICHE E DISTANZE GEOGRAFICHE
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Abstract

La deriva genetica è una delle sorgenti di eterogeneità tra frequenze geniche, in particolare per le frequenze di geni neutrali in popolazioni isolate. La deriva è il campionamento casuale degli alleli tra due generazioni contigue, e causa delle oscillazioni nelle frequenze, che al termine del processo raggiungono inevitabilmente la fissazione di un allele e la perdita dell'altro (o degli altri se al locus ne esiste più d'uno). Genetic drift is the main source of heterogeneity between gene frequencies for neutral genes in isolated populations. The process of drift consists in the random sampling of alleles from one generation to the next, with continuing oscillations in frequencies which end in the fixation of one allele, and in the elimination of the other. La dérive génétique est une des sources d'hétérogénéité entre fréquences géniques, particulièrement pour les gènes neutres dans des isolats de populations. Le processus de dérive est l'échantillonage au hasard des allèles d'une génération à la suivante. La dérive cause des oscillations dans les fréquences, qui aboutissent à la fixation d'un gène et à la perte d'un autre.

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