Dai K, Dollin A E, Gillies C B
School of Biological Sciences A.12, University of Sydney, N.S.W., Australia.
Genome. 1994 Aug;37(4):672-8. doi: 10.1139/g94-095.
Meiotic chromosome pairing behaviour in three normal sheep was surveyed by synaptonemal complex (SC) analysis at the electron microscope level. The SC karyotype of normal rams is composed of a sex pair, three metacentric or submetacentric pairs, and 23 acrocentric autosomal bivalents, with the total autosomal SC length ranging from 309 to 315 mircrons. Five nucleoli are terminally located on the three metacentric, and one large and one small acrocentric autosomal bivalents. XY morphology was used to divide pachytene into five substages. Although pairing abnormalities (mostly SC interactions) were recorded in an average of 16% of the spermatocytes, bivalent-XY association occurred in only 4.7% of the cells.
通过电子显微镜水平的联会复合体（SC）分析，对三只正常绵羊的减数分裂染色体配对行为进行了研究。正常公羊的SC核型由一对性染色体、三对中着丝粒或亚中着丝粒染色体对以及23对近端着丝粒常染色体二价体组成，常染色体SC的总长度在309至315微米之间。五个核仁末端位于三对中着丝粒染色体以及一对大的和一对小的近端着丝粒常染色体二价体上。利用XY形态将粗线期分为五个亚阶段。虽然平均有16%的精母细胞记录到配对异常（大多为SC相互作用），但二价体-XY联会仅发生在4.7%的细胞中。
