We will compute the multilocus conditional distribution 
of the inheritance vectors at all L DS loci given the affectedness
pattern 
of a sib-pair under our general model. By
Bayes Theorem and under Assumption G2:
Now, x and pg together yield the multilocus sib genotypes,
, hence, under Assumption G1:
where 
labels individual sibs and
is a multilocus penetrances (or one minus a penetrance).
This multilocus conditional distribution is a function of the multilocus penetrances and the mating type frequencies which we denote by the global parameter 
.
