Figure 3

Estimated probabilities of sharing one allele IBD versus ancestors’ genetic contributions. Plots of estimated probabilities of sharing one allele identical-by-descent (IBD) from a specific ancestor relative to the product of the genetic contributions of that ancestor to each of the two individuals from A) the Acadian population and B) the Saguenay population. Probabilities that the two individuals share one allele IBD were estimated from 10,000,000 gene-dropping simulations for each shared ancestor. Ancestors are divided into four categories depending on whether they are founders, most recent common ancestors (MRCA), both (MRCA-Founder) or neither of the two (In between). The black line is the identity line, i.e. y = x.