Singh B N, Mohanty S
Centre of Advanced Study in Zoology, Banaras Hindu University, Varanasi, India.
Genome. 1990 Aug;33(4):592-5. doi: 10.1139/g90-087.
Two linked inversions, AL and ZE, located in the opposite limbs of the second chromosome of Drosophila ananassae are separated from each other by nearly 32% of the total length of the second chromosome. Crossing-over between these inversions when heterozygous was studied in females and males by the salivary-gland smear technique using karyotypically homozygous stocks. The results of recombination experiments show that there is a strong suppression of recombination between inversions when heterozygous, in spite of a large euchromatic distance available for crossing-over between them. Thus there is no correlation between chromosome distance and crossing-over between heterozygous inversions in the second chromosome of D. ananassae when studied cytologically.
位于果蝇第二染色体相对臂上的两个连锁倒位，即AL和ZE，它们之间的距离约为第二染色体总长度的32%。利用核型纯合品系，通过唾液腺涂片技术，对雌性和雄性果蝇杂合时这两个倒位之间的交叉互换进行了研究。重组实验结果表明，杂合时倒位之间的重组受到强烈抑制，尽管它们之间有很大一段常染色质区域可供交叉互换。因此，从细胞学角度研究时，果蝇第二染色体杂合倒位之间的染色体距离与交叉互换之间不存在相关性。
