Occurrence of a presumptive C-B translocation carrier [46,XY,t (? Cp-; Bp+)] in a family of D-G translocation carriers [45,D-,G-,t (DqGq)+].

Received May 19, 1969. * This study was supported by Children's Bureau Grant Project No. 917 and NIH Project Grant No. GM 10189. aberrations differ in the affected members of the same kindred, e.g. Marsden et al. (1966), Summitt and Atnip (1966). The present report describes such a family in which a t(DqGq) abnormality has been transmitted through at least four generations, associated in one sibship with a rare type of translocation involving a group B and probably a group C chromosome.