Mice with Robertsonian (Rb) translocations have been discovered in some 45 populations in Europe. In Belgium, we have observed either Rb(4.12) in a heterozygous or homozygous state (2n=39 and 38 respectively), or Rb(4.12) homozygous with a heterozygous Rb(5.10), or both fusions in a hornozygous state (2n=37 and 36, respectively). Some locations are highly polymorphic and heterozygotes are found frequently. These observations suggest that the R b population in Belgium could be of recent origin and probably is the result of introgression from Alsace (France) or Germany.
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