Identification of Chinese hamster chromosome bivalents at diakinesis by quinacrine mustard fluorescence

The eleven chromosome bivalents of the Chinese hamster at diakinesis can be identified on account of their morphology, in combination with the fluorescence pattern. Comparison of the fluorescence pattern of the sex-chromosomes in both mitosis and meiosis shows that the distal part of the short arm of the X chromosome is homologous with part of the Y chromosome. It is not possible, however, to decide with certainty which part of the Y chromosome is involved.