Genome Studio outputs of Manhattan distance graphs of three different SNPs assayed with the 6 K walnut SNP Infinium assay. A shows both parents, ‘Chandler’ (green dot indicated by green arrow) and ‘Idaho’ (light blue dot indicated by blue arrow), heterozygous at a locus. F1 progeny segregation (96:181:76) approximates the 1:2:1 monohybrid segregation ratio of two codominant alleles. B shows ‘Chandler’ heterozygous and ‘Idaho’ homozygous at a locus. F1 progeny segregation (195:158) approximates the 1:1 monohybrid back-cross segregation ratio. C shows both parents monomorphic at the locus and no segregation (353:0) of F1 progeny.