There is no effect of paramutable R allele dosage on the amount of paramutational change promoted by one paramutagenic allele in maize plants trisomic for chromosome 10 in which the R locus resides. It has been confirmed that paramutation at the R locus is not affected by chromosome 10 trisomy if one of the chromosomes carries a rgallele, which is a 'null' element with respect to paramutation. Paramutation systems at the R locus in maize, the B locus in maize, and the sulf locus in tomato, are compared.
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E. D. Styles (1970) studied this question.
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