雌雄蓖麻蚕减数分裂染色体的比较研究  

Comparative studies on meiotic chromosomes of wild silkworm Philosamia cynthia ricini.

作　　者：常平安[1] 刘运强[2] 易发平[3] 宋方洲[3] 

机构地区：[1]重庆邮电学院生物信息学院,重庆400065 [2]西南农业大学农业部蚕桑学重点实验室,重庆400716 [3]重庆医科大学分子生物学教研室,重庆400016

出　　处：《昆虫知识》2006年第1期33-37,共5页Entomological Knowledge

基　　金：国家自然科学基金项目(批准号:39170597);教育部高校骨干教师资助计划(GG-230-10625-1-65)

摘　　要：以蓖麻蚕Philosamia cynthia riciniBoisduval为材料,全面比较了雌雄蓖麻蚕减数分裂前期I染色体的行为变化,从细胞学角度证明了雌蚕减数分裂染色体完全连锁,而雄蚕发生连锁交换;详细观察了雌蚕减数分裂I双线期过程中性染色体的动态变化,发现其存在着自身配对的过程,进而对其起源进化假说进行了探讨,认为其可能来源于一对同源常染色体片段的易位融合。Chromosomal morphological character and behavior during meiotic prophage 1 of male Philosamia cynthia ricini Boisduval were compared with that of female, the results showed that homologous chromosomes during meiosis of female were completely linked, whereas crossing over happened in the male homologous chromosomes. Furthermore, morphological character and behavior of sex chromosome during diplotene stage were observed in great detail, sex chromosome was shown to go on a self-pairing course. The origin and evolution of sex chromosome was hypothesized to result from translocation and amalgamation of a pair of euchromosome fragment.

关 键 词：蓖麻蚕 减数分裂 染色体 进化 

分 类 号：S885.2[农业科学—特种经济动物饲养]