COMPARATIVE STUDIES ON SC KARYOTYPES OFChrysolophus ainherstiae, C. pictus, Phasianus colchicus
白腹锦鸡,红腹锦鸡,中国雉鸡SC组型的比较研究

Micro-spread and silver-stained preparations of spermatocytes of C. am-herstiae, C. pictus and P. colchicus have been analyzed by electron micro-copy. SC karyotypes of three pheasants are very similar and are 2n=82, ZZ/ZW sex ditermined and male is ZZ. No.1 and Z-SC are metacentric, the others are telocentric. Relative length of Z-SCs has strikingly difference among spermatocytes, but the mean is always between No.3 and No.4 SC. The main diiterence of SC karyotypes of three pheasants is the length of corresponding SCs. The consanguinity and probable position of three pheasants in cvolution have been discussed. Large centrioles arc found for the first time in C. amherstiae and C. pictus spermatocytes and can be analyzed at the same time in SC samples prepared by microspreading technique.