Abstract
ABSTRACT Chromosome G-banding analysis was carried out on 30 specimens of Otomys irroratus from six South African localities and eight specimens of O. angoniensis from three localities. While O. angoniensis appeared chromosomally conservative, extensive variation was detected between populations of O. irroratus in the number of heterochromatic short arms. The results obtained were compared with those of our previous study. This species could be divided into three major cytotype groups: group A with mostly acrocentric chromosomes, group B with at least seven large autosomes carrying heterochromatic short arms, and group C in which only four pairs of large autosomes are biarmed. Within group A, three populations carried a tandem fusion between chromosomes 7 and 12, while another population displayed two pairs of unique supernumerary autosomes. The banding patterns of O. irroratus and O. angoniensis ciaomosomes were compared, and five homologous sequences were tentatively identified between the two species. ...
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