CROSSINGOVER IN DROSOPHILA 



209 



TABLE 12 



Effect of exposure of females during early larval period on crossingover 



S' 



No. 1. Female parents exposed four days at 22°C. Six days at 31.5°C. 



No. 2. Control. Female parents hatched at 22°C. 



No. 3. Female parents exposed four days at 41.5°C. Six days at 22°C. 



No. 4. Control. See No. 1, table 11 



