Temperature-Sensitive Mutations in Drosophila melanogaster, VIII. The Homeotic Mutant, ssa40a
AUTOR(ES)
Grigliatti, Thomas
RESUMO
There exists in Drosophila a class of mutations called “homeotic” that cause changes in determination of the imaginal discs. The homeotic mutant, ssa40a, was found to have a temperature-sensitive transformation of the arista segment of the antennal complex to a tarsus of the leg. In a selected stock penetrance was complete, so that at 29°C normal aristae were produced, whereas at 17°C complete tarsi developed in all flies. “Temperature-shift” studies revealed a temperature-sensitive period in the third larval instar. The temperature-initiated action of ssa40a does not appear to result from a simple wave or gradient of determination passing through the disc. Shifts up during the temperature-sensitive period yielded leg tissue proximally, which increased distally with progressively later shifts. Shifts down yielded leg tissue at the aristal base, which retreated with later shifts.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=389178Documentos Relacionados
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