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A series of alleles of a particular gene. In theory probably all genes can exist in more than two alternative forms since mutations can occur at any number of points along their length. In practice, natural selection may eliminate all but one or two of these in wild populations. Examples of naturally occurring multiple allelism are found in the incompatibility systems of plants. For example, in Brussels sprouts (Brassica oleracea var. bullata) there are some 35-40 different incompatibility alleles, termed 5 alleles.
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