Una popolazione appenninica di Mus musculus L. caratterizzata da un cariotipo a 22 cromosomi
Feral mice (Mus musculus L.) with a 22-chromosome complement were found to constitute a mountain population in the central Apennines. The karyotype differs by 9 Robertsonian fusions from that of the common house mouse (2 n = 40). Laboratory hybrids were obtained from these 22-chromosome mice crossed with albino mice; these hybrids have 31 chromosomes and show 9 trivalents in the meiotic diakinesis. 3 mice were found show ing 38, 37 and 34 chromosome complements in a village at the boundary of the...