Graduate Thesis Or Dissertation
 

The effect of temperature on crossvein formation in crossveinless-like strains of Drosophila melanogaster (Meigen)

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  • Development of the posterior crossvein in crossveinless-like strains of Drosophila melanogaster can be influenced by high temperature shocks at specific times in pupal development. Three sensitive periods were detected in age response studies on Ona X, Ona II, 5-hi III; crossvein restoration at 14 hours in pupal development, a crossvein limiting response at 22 hours in pupal development and a reduction in penetrance at 28 hours in pupal development. A further characterization of these responses revealed that at 22 hours there also exists a rapid crossvein restoration which appears to be identical with the response at 14 hours, and another restoration following long durations of treatment at 22 hours. At 28 hours an additional crossvein limiting response was observed. Temperature coefficients have been calculated for all the responses, except those at 28 hours, and these coefficients indicate that the basis of the various responses are due to conformational changes in protein following temperature denaturation. Preliminary genetic studies of the responses showed a profound effect of the major gene, and this gene was localized to 48.1 on the genetic map of the third chromosome. The data have been interpreted as being consistent with affecting either a control mechanism involved in the development of the posterior crossvein, or a reaction sequence involved in the development of the posterior crossvein.
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