Mixed models of inheritance, which assume
one or several identified segregating loci, and
an additional polygenic component, have been
developed. When genotypes at each identified
locus are known, they can be treated as fixed
effects in standard mixed-model techniques
(Kennedy et al., 1992). When only genotypes
at linked markers are known, the uncertainty
resulting from unknown haplotypes and
recombination events has to be taken into
account