To analyze:
Dr. Sophila observed that fruit flies with normal behavior kept at
Introduction:
The fruit flies in the given question show different phenotypes at different temperatures. The probable cause for this might be the inactivity of the gene at a high temperature which is important for the normal behavior or phenotype. Therefore, an organism showing temperature-sensitive mutation is called a temperature sensitive mutant. Temperature sensitive mutant grown in the permissive condition means the mutated gene product behaves normally at the low temperature and shows altered behavior at high temperature. The temperature at which they show normal behavior is called permissive temperature. A temperature sensitive mutant returns to its normal behavior if placed in permissive temperature.
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