Lyon hypothesis

noun
Ly·on hypothesis | \ˈlī-ən- \

Medical Definition of Lyon hypothesis 

: a hypothesis explaining why the phenotypic effect of the X chromosome is the same in the mammalian female which has two X chromosomes as it is in the male which has only one X chromosome: one of each two somatic X chromosomes in mammalian females is selected at random and inactivated early in embryonic development

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