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- U
- Uracil.
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- unequal codon usage (biased codon usage)
- In protein-coding genes, the disproportionate use of one or more of the codons in a codon family.
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- unidentified reading frame (URF)
- An ORF, the product of which is not known.
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- unique DNA (single-copy DNA)
- DNA sequences present in only one copy in the haploid genome.
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- universal genetic code
- The genetic code regulating the translation of the vast majority of genomes.
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- unprocessed pseudogene
- A pseuclogene that has been derived through gene duplication and the subsequent nonfunctionalization or silencing of one of the copies.
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- unrooted tree
- An evolutionary tree that specifies neither the root nor the direction of the evolutionary path.
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- untranscribed sequence (see flanking sequence)
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- URF (see unidentified reading frame)
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