by G. GANEM Department of Zoology, South Parks Road, OX13PS, Oxford, U.K. Present address : Institut des Sciences de l'Evolution, Universite Montpellier II, place E. Bataillon, cc. 64, 34095 Montpellier cedex, France Summary. - Robertsonian populations of the house mouse are characterized by divergent karyotypes (reduced chromosomal number due to the occurrence of centromere chromosomal fusions) when compared to the standard karyotype (2n = 40). The phenomenon concerns a large number of populations with diverse karyotypes and whose origin is very recent. This rapid phenomenon raises questions about the mechanisms responsible for it. The aim of this paper is to underline the importance of a better knowledge of the Robertsonian populations ecology for the understanding of the evolutionary phenomenon. A review of the literature is proposed showing that Robertsonian populations occur mostly in commensal habitats. Resume. - Les populations robertsoniennes de la souris domestique presentent des caryotypes divergents du type standard ä 2n = 40 chromosomes. Cette divergence se produit ä la suite de l'apparition et de la fixation de fusions de deux chromosomes au niveau de leur centromere entrainant la reduction du nombre chromosomique total. Ce phenomene concerne un grand nombre de populations caracterisees par des combinaisons
Mammalia - International Journal of the Systematics, Biology and Ecology of Mammals – de Gruyter
Published: Jan 1, 1993
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