Normal meiosis in two 47,XYY men

Details of testicular histology and meiosis are given for two 47,XYY men, one an oligospermic childless individual, the other a fertile man with near-normal spermatogenic activity in his testes. Examination of the chromosomes at meiosis, with “Q” and “C” staining, gave no evidence for the occurrence of the second Y chromosome in the germ line of either individual.