Abstract
Several alleles of the nivea locus of Antirrhinum majus, both stable and unstable, have been characterised genetically (Harrison and Carpenter 1973 a, b). In this work the niv-44 allele is characterised at the molecular level. It contains a 5kb insertion element, Tam 2, which has 14 base pair inverted repeats. There is a three base pair duplication at the target site, which is at the first intron-exon boundary of the chalcone synthase gene. Tam 2 homologous sequences are present in multiple copies in several A. majus lines, including niv-53, and most have at least a 2.9 kb sequence in common with the copy at the chalcone synthase gene. Possible reasons for the apparent stability of the niv-44 allele and molecular explanations for the role of this allele in paramutation in A. majus are discussed.
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