has_variant_part variant allele variant single locus complement Instances of this class are sets comprised of all allels at a specified genomic location where at least one allele is variant (non-reference). In diploid genomes this complement typically has two members. Note that this class also covers cases where deviant numbers of genes or chromosomes are present in a genome (e.g. trisomy of chromosome 21), even if their sequence is not variant. A single locus complement in which at least one member allele is considered variant, and/or the total number of features in the complement deviates from the normal poloidy of the reference genome (e.g. trisomy 13). variant allelic complement single locus complement