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Temperature-Sensitive Mutations in Drosophila melanogaster , VIII. The Homeotic Mutant, ss a40a
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| Zeitschriftentitel: | Proceedings of the National Academy of Sciences |
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| Personen und Körperschaften: | , |
| In: | Proceedings of the National Academy of Sciences, 68, 1971, 6, S. 1307-1311 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Proceedings of the National Academy of Sciences
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| Schlagwörter: |
| Zusammenfassung: | <jats:p> There exists in <jats:italic>Drosophila</jats:italic> a class of mutations called “homeotic” that cause changes in determination of the imaginal discs. The homeotic mutant, <jats:italic> ss <jats:sup>a40a</jats:sup> </jats:italic> , 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 <jats:italic> ss <jats:sup>a40a</jats:sup> </jats:italic> 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. </jats:p> |
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| Umfang: | 1307-1311 |
| ISSN: |
0027-8424
1091-6490 |
| DOI: | 10.1073/pnas.68.6.1307 |