Results: In group B the frequencies of spermatozoon disomy for chromosomes including X,Y and 9 were 0. 0% and 0. 0% resp果 :B组精子 X、Y、和 8号染色体的二体频率分别为 0 . 0 %、0 . 0 % ,与 C组 ( 0 . %、0 % )相比差别无显著性 ;