Snapshot of segregating haplotypes after fixation of A allele. (a), Sample simulation with G = 64 loci and R = 0.005 showing the fixation of the strongly altruistic A-type at generation 3,315 after 133 prior unsuccessful introductions into the population. (b), Snapshot of 13 segregating haplotypes around the focal locus out of 81 haplotypes when all loci are considered. Frequencies are given in the last column. The two most frequent haplotypes are clearly complementary.