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I Pisum data and repeatedly corhrmed since in a wide variety of organisms, is regarded as a universal principle in Mendelian heredity. Departures from the law have been reported from time to time, only to prove unfounded, in most instances a t least, on close analysis. The present study is concerned with a seeming exception to the rule at the well-known R locus in maize conditioning aleurone and plant color.All the RI c? gametes (self-colored aleurone) produced by RrRSt plants (heterozygous stippled aleurone) were found to give a different phenotype in testcrosses on rrrr 9 9 (colorless aleurone) than the R' 8 gametes formed by R'R' sibs. The altered

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