Pseudoallelism
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Shows how various studies permit the classification of genes relative to each other as being allelic, non-allelic, or pseudoallelic. Describes in detail the Drosophila experiments proving pseudoallelism for apricot and white and the cis-trans position effects. Mentions cases of pseudoallelism in other organisms; details are given of another pseudoallelic series in Drosophila, involving the halteres. Uses models to explain the cis-trans position effects, and the origin and evolution of pesudoalleles.
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