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cistron

A Dictionary of Plant Sciences | 1998 | | © A Dictionary of Plant Sciences 1998, originally published by Oxford University Press 1998. (Hide copyright information) Copyright

cistron A section of the DNA molecule that specifies the formation of one polypeptide chain. A complementation test is performed to determine whether two mutant sites of a gene are in the same cistron or in different ones. In the cis configuration, both mutants are on one homologous chromosome and both wild-types are on the other (a1a2/++), producing a wild-type phenotype. In the trans configuration each homologue has a mutant and a non-mutant (a1+/a2+), producing a mutant phenotype.

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