Incomplete dominance
Incomplete Dominance (pronunciation: /ɪnkəmˈpliːt dəˈmɑːnəns/) is a genetic phenomenon where neither of the two versions of a gene is completely dominant over the other. This results in a third phenotype, where the expressed physical trait is a combination of the phenotypes of both alleles.
Etymology
The term "Incomplete Dominance" is derived from the Latin words 'incompletus' meaning 'incomplete', and 'dominantia' meaning 'dominance'. It was first used in the field of genetics to describe the situation where the phenotype of the heterozygote is intermediate between the phenotypes of the homozygote.
Related Terms
- Allele: One of two or more versions of a gene that are found at the same place on a chromosome.
- Phenotype: The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
- Genotype: The genetic constitution of an individual organism.
- Homozygote: An individual having two identical alleles of a particular gene or genes and so breeding true for the corresponding characteristic.
- Heterozygote: An individual having two different alleles of a particular gene or genes, and so not breeding true for the corresponding characteristic.
- Dominant: In genetics, a dominant gene is one that masks the effect of the recessive gene.
- Recessive: In genetics, a recessive gene is one that can be masked by a dominant gene.
See Also
External links
- Medical encyclopedia article on Incomplete dominance
- Wikipedia's article - Incomplete dominance
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