denotes denotes single locus complement intrinsic genotype allelic genotype A genotype that specifies the 'allelic state' at a particular location in the genome - i.e. the set of alleles present at this locus across all homologous chromosomes. single locus genotype An 'allelic genotype' describes the set of alleles present at a particular location in the genome. This use of the term 'genotype' reflects its use in clinical genetics where variation has historically been assessed at a specific locus, and a genotype describes the allelic state at that particular location. This contrasts to the use of the term 'genotype in model orgnaism communities where it commonly describes the allelic state at all loci in a genome known to vary from an established reference or background. 1. The zebrafish "fgf8a<ti282a>/fgf8a<+>" allelic genotype describes the combination of gene alleles present at a specific gene locus (the fgf8a locus - which here has a heterozygous state). 2. The human allelic genotypes in the VCF records describes below describe the set of SNPs present at specific positions on Chromosome 20 in the human genome. The first record describes a heterozygouse C/T allelic genotype at Chr20:2300608, and the second describes a homozygous G/G allelic genotype at Chr20:2301308. ##fileformat=VCFv4.2 ##FORMAT=<ID=GT, Description="Genotype, 0=REF, 1=ALT"> #CHROM POS REF ALT FILTER FORMAT SAMP001 20 2300608 C T PASS GT 0/1 20 2301308 T G PASS GT 1/1 (derived from https://faculty.washington.edu/browning/beagle/intro-to-vcf.html) 3. Some allelic genotype formats encode the genotype as a single string - e.g. "GRCh38 Chr12:258635(A;T)" describes a heterozygous A/T allelic genotype of SNPs present at a specific position 258635 on human chromosome 12. genomic entity