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This MERLIN is not a wizard, but a new software package offering more rapid calculation of multipoint linkage likelihoods in larger pedigrees than has been possible. The practical advances provided by MERLIN are certainly welcome, but perhaps we need a little magic as well.
The gene that underlies a locus determining complex differences between two social forms of fire ants is a homolog of a moth odorant receptor gene—which bodes well for a better understanding of social control in insects.
It makes sense that our genome has evolved to have two copies of every gene—just in case something goes wrong, you still have a spare. But from the perspective of a geneticist, a diploid genome makes finding causative genes somewhat of a challenge, or at best, time consuming. One solution may be induced mitotic recombination.