Medical Definition of coupling
1: the joint together with its supporting structures between the last lumbar vertebra and the sacrum that joins the hindquarters of a quadruped to the trunk; broadly : the part of the body or the conformation and proportionate length of the part of the body that joins the hindquarters to the forequarters
2: the tendency of linked traits to be inherited together in offspring of a double heterozygote when both dominant genes occur on one chromosome and both recessive genes occur on the homologous chromosome—compare repulsion
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