Abstract
The eightvestigial strains,vg, vg-co-iso,vg;se-co-iso,vg-ms-1-co-iso,vg-ms-1; 3-co-iso,vg-ms-co-iso,vg-ms;se andvg-ms;se-co-iso showed various temperature responses. The five strains of thevg-ms group showed a greater response to temperature than did the three strains of thevg group. This tendency became more pronounced the higher the temperature was. The difference in temperature response between thevg-ms-1; 3-co-iso andvg-ms-co-iso strains indicates that the phenotypic expression ofvestigial is influenced by a modifier or modifiers located on the second chromosome of the Oregon(iso) strain. It was found that the X chromosome of the Oregon(iso) strain showed a slight modifier action in females but not in males of thevg-ms mutant.
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