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Post-zygotic reproductive isolating mechanisms between two chromosomally distinct, allopatric Otomys irroratus (Brants, 1827) populations (Kamberg and Karkloof) were studied in the laboratory by means of breeding trials, and by comparing the postnatal development of young of intrapopulation and interpopulation pairs. In contrast to the 100% breeding success of intrapopulation pairs, fewer than half...