Dosage-dependent modification of position-effect variegation in Drosophila.

Abstract excerpt

Many loci in Drosophila exhibit dosage effects on single phenotypes. In the case of modifiers of position-effect variegation, increases and decreases in dosage can have opposite effects on variegating phenotypes. This is seemingly paradoxical: if each locus encodes a limiting gene product sensitive to dosage decreases, then increasing the dosage of any one should have no effect, because the others should remain...

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