Codominance
Codominance (pronunciation: /koʊˈdɒmɪnəns/) is a genetic phenomenon in which two different versions of a gene, known as alleles, are expressed simultaneously in a heterozygote.
Etymology
The term "Codominance" is derived from the Latin words 'co' meaning 'together' and 'dominance' meaning 'rule'. It was first used in the field of genetics to describe the situation where two different alleles for a genetic trait are both expressed.
Definition
In genetics, codominance is a form of dominance where the alleles of a gene pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is neither dominant nor recessive. A classic example of codominance is the ABO blood group in humans.
Related Terms
- Alleles: Different versions of a gene that are found at the same place on a chromosome.
- Genotype: The genetic makeup of an organism.
- Phenotype: The observable physical properties of an organism.
- Heterozygote: An organism that has two different alleles of a gene.
- Homozygote: An organism that has two identical alleles of a gene.
- Dominance: A relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus.
- Recessive: An allele that produces its characteristic phenotype only when its paired allele is identical.
See Also
External links
- Medical encyclopedia article on Codominance
- Wikipedia's article - Codominance
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