Institute of Molecular Biology, Academy of Sciences of the USSR, Moscow, USSR.
Genetics. 1976 Jun;83(2):355-60. doi: 10.1093/genetics/83.2.355.
Spontaneous crossing over was studied by means of combined cytological and genetic methods in F(1)Drosophila virilis x D. texana females (series I) and in D. virilis females carrying a D. texana fifth chromosome in heterozygous condition (series II). The main criterion utilized to distinguish the oogonial crossovers from the meiotic ones is the identity of cytological positions of genetic exchange in crossovers constituting a cluster. Five clusters of crossovers with identical positions of exchange were found in the first series of experiments. In the second series of experiments not a single cluster of crossovers resulting from oogonial crossing over was found.
自发交叉通过结合细胞学和遗传学方法在 F(1) 秀丽隐杆线虫 x D.texana 雌性(系列 I)和携带 D.texana 第五染色体的杂合状态下的 D. virilis 雌性(系列 II)中进行了研究。用于区分卵原细胞交叉与减数分裂交叉的主要标准是构成簇的遗传交换的细胞学位置的同一性。在第一个系列实验中发现了五个具有相同交换位置的交叉簇。在第二个系列实验中,没有发现任何一个来自卵原细胞交叉的交叉簇。