【摘要】 本文首次报道了血革螨科上海真厉螨染色体组型及其C带的研究。上海真厉螨染色体数目表明,其具有单二倍体性决定系统(n=8,2n=16),雄性体细胞具有8条染色体,雌性体细胞具有16条染色体。染色体可分为3组,1—3组,4—6组,7—8组染色体。染色体组型的测量统计分析表明,染色体着丝点位置分别为中部(1、2和3号)、亚中部(4、5和6号)及端点(7和8号)。C-带主要位于着丝点区。第2染色体长臂和短臂及第3染色体的短臂具有插入型C-带,第7和第8染色体为端型C-带。本文还讨论了血革螨科上海真厉螨的组型、性决定、染色体多态现象及其C-带的带型特征等问题。更多还原

【Abstract】 The present paper first reports the studies on the karyotype and C-banded chromosomes of Eulaelaps shanghaiensis of the family Haemogamasidae.The results may be summarized as follows:1.The karyotype of E.shanghaiensis was studied from eggs by cellophane squash technique,taking eggs by caesarean section,using Giemsa stain.The chromosome number of E.shanghaiensis was found to be 8 (male) and 16 (female) chromosomes.There was a haplodiploidy sex determination system in E.shanghaiensis.All chromosomes were monokinetic and of these chromosomes,Nos.1,2 and 3 were metacentric,Nos,4,5 and 6 were submetacentric,and Nos.7 and 8 were acrocentric.Based on their relative lengths,centromere index,arm ratio and other features,8 chromosomes were tentatively classified into 3 groups:Group 1-3,Group 4-6,Group 7-8.2.C-banding by barium hydroxide using Giemsa (CBG) showed that C-bands of E.shanghaiensis were located mainly in the centromeric regions.The long aim and short arm of No.2 chromosome and short arm of No.3 chromosome were with interstitial C-bands.No 7 and 8 chromosomes were with telomeric C-bands.Finally,some problems concerning the karyotype,sex determination system,chromosome polymorphism and the characteristics of C-banding patterns of E.shanghaiensix were also discussed.更多还原