The presence of the male tetraploid found in F2 (♀) × diploid red crucian carp (♂) suggested that the genotype of XXXY probably existed in the tetraploid progeny .
F（2♀）×红鲫（♂）中雄性四倍体鱼的存在说明在四倍体后代中存在基因型为XXXY的个体。
xxxy