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在染色体配对或交叉形成中表现畸变的减数分裂突变体是研究染色体配对和重组的机制以及遗传控制的好材料。根据前期Ⅰ染色体的细胞学行为可将这些突变体分为不联会和联会消失两种。前者的特征是同源染色体联会部分或完全受阻,后者的特征则是在染色体配对后二价体过早分离。
Mesenteric mutants that exhibit aberrations in chromosomal pairing or cross formation are good materials for studying the mechanisms of chromosome pairing and recombination as well as for genetic control. According to the cytology of the pre-I chromosome, these mutants can be divided into two groups, the non-union and the union disappeared. The former is characterized by partial or complete blockage of homologous chromosome associations, the latter characterized by premature separation of the bivalents upon chromosome pairing.