Dwarfism is a recessive trait in Hereford cattle. A rancher in western Texas discovers 
that several of the calves in his herd me dwarfs, and he wants to eliminate this 
undesirable trait from the herd as rapidly as possible. Suppose that the rancher hires 
you as a genetic consultant to advise him on how to breed the dwarfism trait out of the 
herd. What crosses would you advise the rancher to conduct to ensure that the gene 
causing dpvarfism is eliminated from the herd?