25
Dec
2009
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Glossary

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O

open reading frame (ORF)
A DNA sequence that is potentially translatable into a protein.
operational taxonomic unit (OTU)
Any of the extant taxonomic units under study.
operon
A genetic unit or cluster that consists of one or more genes that are transcribed as a unit and expressed in a coordinated manner.
ORF
(see open reading frame)
orthology
Sequence similarity as a consequence of a speciation event.
OTU
(see operational taxonomic unit)
out-of-phase overlapping
The encoding of two or more proteins in different frames of the same DNA sequence.
overdominance (heterosis, heterozygote advantage, hybrid vigor)
A selection regime resulting from the heterozygote having a higher fitness than either homozygote.