【摘要】 本文采用外周血淋巴细胞培养法研究了蒙古羊和东北细毛羊的染色体组型和分带。结果表明,其二倍体数目均为2n=54.54条染色体共分出124条带。两种绵羊染色体中A组3对中着丝点染色体和x染色体没有明显的C带区,y染色体染得略深且均匀,B组23对常染色体C带深染且呈多态性。另外,本文还对这两种绵羊与成都麻羊从染色体组型和分带等方面进行了比较,为山羊、绵羊由2n=60共同祖先进化而来这一假说提供了又一证据。更多还原

【Abstract】 This paper presents the characters of the Karyotype and banding of Menggu .sheep and Northeast sheep. Chromosome preparation was made from periphal -lood lymphocytes, The diploid chromosome are 2n=54 in both Sheep. They are made out 124 bandings. The No. 1 to 3 metacentric chromosome and X-chromosome do not show remarkable C-banding’range in both sheep. Y-chromosome is stained evenly and deeply. The other chromosomes are stained evenly and varied. On the.basis of comparing the karyotypes and banding patern of these two sheep and " Chengdu goat" , it means that this study supports the hypothesis of sheep and goat evoluted from the same ancestor(2ns= 60).更多还原