| Codman's triangle | In radiology, the interface between growing bone tumour and normal bone, presenting as an incomplete triangle formed by periosteum. (05 Mar 2000) |
|---|---|
| Codman's tumour | Chondroblastoma of the proximal humerus. (05 Mar 2000) |
| Codman, Ernest Amory | <person> U.S. Surgeon, 1869-1940. See: Codman's sign, Codman's triangle, Codman's tumour. (05 Mar 2000) |
| codogenic | Formed by a code; specifically, the genetic code. (05 Mar 2000) |
| codominance | <genetics> Two alleles of a gene which result in distinctly different phenotypes, but when they are both inherited together in an individual (one from the mother and one from the father - called heterozygosity), the individual has both of the phenotypes. For example: if one allele is for red hair and the other allele is for blue hair, then the individual will have patches of blue hair and patches of red hair. (This is in contrast to incomplete dominance, where the individual would inherit a blend of the two alleles and have purple hair). (09 Oct 1997) |
| codominant | In genetics, denoting an equal degree of dominance of two genes, both being expressed in the phenotype of the individual; e.g., genes A and B of the ABO blood group are codominant; individuals with both are type AB. (05 Mar 2000) |
| codominant allele | In genetics, denoting an equal degree of dominance of two genes, both being expressed in the phenotype of the individual; e.g., genes A and B of the ABO blood group are codominant; individuals with both are type AB. (05 Mar 2000) |
| codominant gene | A set of two or more alleles, each expressed phenotypically in the presence of the other. (05 Mar 2000) |
| codominant inheritance | Inheritance in which two alleles are individually expressed in the presence of each other; there may be other alleles available at the locus that may or may not exhibit codominance. (05 Mar 2000) |
| codominant trait | See: codominant. (05 Mar 2000) |
| codon | <molecular biology> The coding unit of DNA that specifies the function of the corresponding messenger RNA. A triplet of bases recognised by anticodons on transfer RNA and hence specifying an amino acid to be incorporated into a protein sequence. The code is degenerate, i.e. Each amino acid has more than one codon. The stop codon determines the end of a polypeptide. (18 Nov 1997) |
| codon, initiator | Any codon that directs initiation of genetic translation (translation, genetic) by stimulating the binding of initiator trna. In prokaryotes, the codons aug or gug can act as initiators while in eukaryotes, aug is the only initiator codon. (12 Dec 1998) |
| codon, nonsense | A codon that is not assigned to an amino acid or to any stop signal. It was originally thought that nonsense codons were synonymous with terminator codons (codon, terminator) in that they signaled termination of a protein chain. Recent studies have found this not to be true. (12 Dec 1998) |
| codon, terminator | Any codon that signals the termination of genetic translation (translation, genetic) by triggering the hydrolysis of the aminoacyl bond connecting the completed polypeptide to the trna. Terminator codons (uaa, uag, and uga) do not specify amino acids. (12 Dec 1998) |