Lyon, Mary F.


Lyon,

Mary F., English cytogeneticist, 1925–. Lyon hypothesis - Synonym(s): lyonizationlyonization - the normal phenomenon that wherever there are two or more haploid sets of X-linked genes in each cell, all but one of the genes are inactivated, apparently at random, and have no phenotypic expression. Synonym(s): Lyon hypothesis; X-inactivation