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genetic code |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.06 sec. |
genetic codeSequence of nucleotides in DNA and RNA that determines the amino acid sequence of proteins. A messenger RNA molecule synthesized from the DNA directs the synthesis of the protein. Three adjacent nucleotides constitute a unit known as a codon; each codon codes for a single amino acid. There are 64 possible codons, 61 of which specify the 20 amino acids that make up proteins. Because most of the 20 amino acids are coded for by more than one codon, the code is called degenerate. Once thought to be identical in all forms of life, the genetic code has been found to vary slightly in certain organisms and in the mitochondria of some eukaryotes. |
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If a genotype is an organism's genetic coding and a phenotype its genetically determined physical properties (brown eyes, big ears, etc. The oil of wintergreen had altered the genetic coding of the leaves. Collectively, the groups found not one, not two, but 22 distinct defects in the genetic coding that makes up BRCA1. |
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genetic coding
