【摘要】 采用常规的白细胞培养技术及ＢＳＧＣ－带技术分析了白豚的核型、Ｃ－带核型。结果是：白豚的染色体数目２ｎ＝４４，其核型由１２条中部着丝点染色体、１８条亚中部着丝点染色体、４条亚端部着丝点染色体、８条端部着丝点染色体和２条性染色体所组成。染色体臂数（ＮＦ）雌性为７６，雄性为７５。Ｃ－带异染色质呈现出很深的着色区，主要分布在染色体臂上，着丝点区则几乎没有。Ｃ－带异染色质的量约为总染色质量的１２％。这一结果表明白豚与海生豚类的核型、Ｃ－带核型有较明显的相似性。更多还原

【Abstract】 The karyotype and the C-band patterns of the Baiji dolphin (Lipotes vexillifer) was performed on cultures of peripheral leucocytes. The chromosome number of diploid is 44 (2n =44). The karyotype was composed of 12M, 18SM, 4St, 8T and 2 sex chromosome. The largest autosome was ST1, and the smallest was T4. X chromosome was the largest in M group, and Y was the smallest in T group. The C-band heterochromatin was mainly present in the chromosome arm area as distinct blocks. The centromeric regions were faintly stained.The largest heterochromatic blocks were seen proximal to the middle of the long arms of the chromosome SM1, SM2, ST1 and ST2. The size heteromorphism was found in the terminal heterochromatic blocks of SM1, ST1 and in the interstitial of SM5, T1, T2. The C-heterochromatin approximated 12% of the total chromatin in one cell measured.更多还原