Linkage Interrelations of Three Genes for Rex (Short) Coat in the Rabbit

Abstract
Three races of short-haired (rex) rabbits have originated, each by a recessive mutation in a different gene. The genes responsible for 2 of these mutations (r 1 and r 2) are borne in the same chromosome, since they are linked with about 10 or 12% of crossing-over. The gene for the 3rd mutation (r 3) lies in a different chromosome, since it recombines freely with both r 1 and r 2.