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Incomplete dominance



A kind of dominance occurring in heterozygotes in which the dominant allele is only partially expressed, and usually resulting in an offspring with an intermediate phenotype.


In incomplete dominance, a heterozygous organism carrying two alleles wherein one is dominant and the other one is recessive, (e.g. Aa), the dominant allele will only be partially expressed. Hence, the heterozygote (Aa) will have an intermediate phenotype.

A typical example is the color of the flower in which R symbolizes the dominant allele for red pigment and r is the recessive allele for no pigment. In incomplete dominance, the heterozygous plant carrying both alleles, Rr, will not be able to produce enough red pigment (since the dominant allele is only partially expressed) and therefore will appear pink.

Synonym: partial dominance.
Compare: complete dominance, codominance. See also: allele.

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genetic phenotype

... that i need someone to explain it to me what happens to the concepts dominance and recessiveness when we are able to read the DNa sequences in ... genetic phone type, do we describe it as dominance, co-dominance or incomplete dominance? thank you

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by ladwer
Mon Nov 05, 2012 6:52 pm
Forum: Genetics
Topic: genetic phenotype
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2. what comes to my mind - mitochondrial/plastidial genome, incomplete dominance, codominance etc.

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by JackBean
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Incomplete Dominance Biology Question?

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by OnePieceKnight
Fri Mar 16, 2012 1:31 am
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Re: two different color eyes

... parents carried different dominant/recessive traits. This caused an incomplete dominance, where the 2 genes are only partially expressed.

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by Shri
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Topic: two different color eyes
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... Is my second 'definition' more correct? So, in the case of complete dominance (on the same loci) can we call this an epistatic effect? What about co-dominance/incomplete dominance? Is this also epistatic? IE. the 3 genotypes: AA = Black Fur, aa = ...

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by ReMuSoMeGa
Tue Jan 24, 2012 10:45 pm
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