Abstract: Karyotypes and serum transferrin patterns were examined in Asian and Oceanian black rats (R. rattus). Japanese R. r. tanezumi and Malayan R. r. diardii had 2n=42, but Australian and New Guinea R. r. rattus showed 2n=38 chromosomes. F1 hybrids between Japanese and Australian rats and Malayan and New Guinea rats had 2n=40 chromosomes which consists of the two genomes of both parents. Although various matings between the F1 hybrids were made, only one F2 male rat with 2n=39 chromosomes was obtained. The F1 hybrids seem to be semisterile. Parental ...
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Topics: 
Genetics
Zoology
Molecular biology