Active duplicate PgiC genes in sheep's fescue, Festuca ovina, are associated with a PCR marker of
specific length (about 370 bp, of which 231 are in an intron). Using this marker, the frequency of
plants with duplicate genes is estimated to be about 10% in a population from southern Sweden.
The close molecular similarity between the electrophoretically different duplicated genes is in
accordance with the conclusion reached earlier that they are indeed alleles at the same locus.