Delineation of inv6 haplotype block in M. guttatus individuals derived from wild IM plants by one generation of outbreeding (n = 96). Each cell represents the genotype of an individual genotyped at 17 markers across chromosome 6. Genotypes carrying at least one inv6-associated allele are shown in blue (for the 13 inv6-spanning markers) and non-inv6 genotypes are shown in white. Black indicates missing data, and three non-inv6 genotypes (likely genotyping errors or double crossovers) within the inv6 block are shown in green.