Q- AND C-BAND CHROMOSOME MARKERS IN INBRED STRAINS OF MUS MUSCULUS

D. A. Miller ¹, R. Tantravahi ¹, V. G. Dev ¹, and O. J. Miller ¹

¹ Departments of Human Genetics and Development and of Obstetrics and Gynecology, College of Physicians and Surgeon, Columbia University, New York, N.Y. 10032

Differences in the number of chromosomes with secondary constrictions and in the size of the C-band region on certain chromosomes have been observed among the following inbred strains of Mus musculus: C57BL/10J, C57BR/cdJ, DBA/1J, CBA/J, BALB/cJ, and AKR. These differences are useful as indicators of the location of rRNA genes and as normal chromosome markers. The size of each C-band region appears to remain constant over many generations. Only one probable change in the size of a C-band region was found.

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