THE CONTROL OF BRISTLE PATTERN BY HAIRY-WING IN DROSOPHILA MELANOGASTER
An analysis of the control of developmental patterns exercised by the mutant gene Hairy-wing 49c (to be referred to as Hairy-wing) in Drosophila melanogaster was undertaken. This gene, in addition to causing the formation of chaetae on the wing veins, controls the formation of extra macro- and microchaetae on the thorax. By means of genetic mosaics, produced by inducing somatic crossing-over in heterozygous larvae with x irradiation, a developmental analysis of the differences in differentiation in the tissues of the Hairy-wing homozygous genotypes was performed. Two of the mosaic classes, categorized on the basis of the position of the mosaic patches with respect to the dorsocentral region, which had been expected to occur in equal frequencies, were found in numbers which differed significantly from equality. It is postulated that there is an alteration of the position of the centers of the fields of developmental organization by homozygous Hairywing tissue, due to its high chaetogenic activity. X irradiation causes Hairy-wing heterozygotes to express themselves in a homozygous-like fashion. Interactions were observed between the 3 different genotypes in mosaics. Hairy-wing homozygous tissue acts semi-autonomously in mosaics. Tissue, homozygous for the wild type gene for Hairy-wing, acts non- autonomously and will occasionally produce extra macrochaetae in the presence of adjacent homozygous and, more rarely, heterozygous Hairy-wing tissue. (M.P.G.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-18-000007
- OSTI ID:
- 4179071
- Resource Relation:
- Other Information: Thesis. Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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