  We consider a population of N individuals, whose dynamics through time is
represented by a biparental Moran model with two types: an advantaged type and
a disadvantaged type. The advantage is due to a mutation, transmitted in a
Mendelian way from parent to child that reduces the death probability of
individuals carrying it. We assume that initially this mutation is carried by a
proportion a of individuals in the population. Once the mutation is fixed, a
gene is sampled uniformly in the population, at a locus independent of the
locus under selection. We then give the probability that this gene initially
comes from an advantaged individual, i.e. the genetic contribution of these
individuals, as a function of a and when the population size is large.
