The mechanism of genetic control of traits showing continuous variation. See continuous variation. The existence of a range of phenotypes for a specific character, differing by degree rather than by distinct qualitative differences. The association of polypeptide subunits to form the final structure of a protein.
R factor See R plasmid .
A plasmid containing one or several transposons with resistance gene s. Plasmids carrying genes controlling resistance to various drugs. RAM mutation Ribosomal ambiguity mutation that allows incorrect tRNAs to be incorporated into the translation process. Changes in allele frequency that result because the gene s appearing in offspring are not a perfectly representative sampling of the parental genes. See also founder effect .