Figure 4

Estimated probabilities of IBD sharing for a segment versus one allele. Plots of estimated probabilities of sharing one segment identical-by-descent (IBD) from a specific ancestor relative to the estimated probabilities to share one allele IBD from that same ancestor for a pair of individuals from A) the Acadian population and B) the Saguenay population. Probabilities that the two individuals share one allele or one segment IBD were estimated from 10,000,000 (for allele sharing) or 100,000,000 (for segment sharing) simulations for each common ancestor. Ancestors are divided in four categories depending on whether they are founders, most recent common ancestors (MRCA), both (MRCA-Founder) or neither of the two (In between). The solid black line is the identity line and colored lines are simple regression lines between IBD sharing of a segment and IBD sharing of an allele. Three different segment lengths are considered and shown for A: 3.30, 5.87 and 12.61 cM and for B 3.54, 7.37 and 10.03 cM (Table 3).