Proportion of genes with various numbers of extant copies annotated with given high-level functional categorizations. x-axis: number of genomes (out of three: peach, cacao and grape) with more than one copy of a given gene. Score 0 indicates all three genomes contain exactly one copy of the gene; 1 indicates that one of the genomes has two or three copies, 2 means that two of the genomes have two or three copies and 3 means that all three genomes have two or three copies. y-axis: proportion of these gene sets with the indicated annotation. Positive slope indicates fractionation resistance, negative slope indicates fractionation-prone genes. Thick lines indicate statistical significance of non-zero slope.