Pericentric Inversion of Chromosome 9

CHROMOSOME banding systems allow new insight into the variations of the human chromosome complement. The cases discussed below show the value of carefully using a combination of banding techniques and we feel that a more routine use of centromeric (C) banding in conjunction with Giemsa (G) or fluorescence (Q) banding helps in establishing the true frequency of variation in the centromeric region. Our evidence suggests that pericentric inversion of chromosome 9 is a relatively common heteromorphism of the human karyotype.