Abstract
Three Chinese hamster stocks were established having a reciprocal translocation in a homozygous state from males irradiated with 400R X-ray. Morphological changes allowed to easily identify two translocation chromosomes in T(1;2)9Idr, but only one of them in T(2;10)3Idr and T(2;8)5Idr without banding. Both males and females heterozygous for each translocation were semi-sterile, whereas homozygotes were fully fertile.
