Lifschytz E
Genetics. 1975 Feb;79(2):283-94. doi: 10.1093/genetics/79.2.283.
The effect of heat on two small adjacent segments at the base of the X chromosome was examined. Recombination in the two segments delimited by recessive lethals was measured after treatment with 30 degree and 34 degree. Both segments were sensitive at 30 degree, while only the proximal one responded to 34 degree treatment. When the same segments were studied in structural heterozygotes (for deletions) the relative increase in recombination was greater, suggesting that heat exerts its effect on the "pairing" rather than the "exchange" components of crossing over. The effect of c (3) G/+ on the same segments in both homozygous and heterozygous structurals was studied. The results indicate that this meiotic mutant mediates its effect on a step different than that affected by heat.
研究了热对X染色体基部两个相邻小片段的影响。在用30摄氏度和34摄氏度处理后，测量了由隐性致死基因界定的两个片段中的重组情况。两个片段在30摄氏度时都敏感，而只有近端片段对34摄氏度处理有反应。当在结构杂合子（缺失）中研究相同片段时，重组的相对增加更大，这表明热对交换的“配对”而非“交换”成分产生影响。研究了c(3)G/+在纯合和杂合结构中对相同片段的影响。结果表明，这种减数分裂突变体在一个不同于热影响的步骤上介导其作用。
