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Modern Genetic Analysis Glossary
U
U Uracil, or uridine.
underdominance A phenotypic relation in which the phenotypic expression of the heterozygote is less than that of either homozygote.
unequal crossover A crossover between homologs that are not perfectly aligned.
uniparental inheritance The transmission of certain phenotypes from one parental type to all the progeny; such inheritance is generally produced by organelle genes.
unstable mutation A mutation that has high frequency of reversion; a mutation caused by the insertion of a controlling element, whose subsequent exit produces a reversion.
uracil A pyrimidine base that appears in RNA in place of thymine found in DNA.
URF (unassigned reading frame) An open reading frame (ORF) whose function has not yet been determined.
uridine The nucleoside having uracil as its base.

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