hypostasis

hypostasis (hi-pos´ta-sis)

1. Formation of a sediment at the bottom of a liquid. 2. hypostatic congestion 3. The phenomenon whereby the phenotype that would ordinarily be manifested at one locus is obscured by the genotype at another epistatic locus; e.g., in humans, the phenotype for the ABO blood group locus can be expressed only in the presence of its precursor, H substance. The Bombay factor in the homozygous state blocks H formation and obscures the ABO phenotype. [G. hypo-stasis, a standing under, sediment]
postmortem h. postmortem livedo
pulmonary h. hydrostatic congestion of the lung.

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