The numbers of the chromosomes are 33, 32 or 31 for the male and 32, 31 or 30 for the female respectively. This difference may be caused by the X-autosome translocation and by a centric fusion between the two pairs of acrocentric chromosomes.

• 该种雄性染色体为 33、32或 31,雌性为 32、31或30 ,这种差异可能是由于染色体间融合和易位所致。