Cummings, Michael R. Department of Biological Sciences, University of Illinois, Chicago, Illinois.
Last reviewed:February 2019
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- Incomplete dominance
- Dominance hierarchies
- Links to Primary Literature
- Additional Readings
The expression of a heritable trait in both the homozygous and heterozygous conditions. Genetic dominance (Fig. 1) is a cornerstone of the basic laws of biological inheritance (also known as Mendelian inheritance or Mendelism). In particular, genetic dominance occurs when a trait is expressed in a heterozygote that is phenotypically indistinguishable from the trait expressed in the homozygote. Note that dominance is not an inherent property of a gene; instead, it is a term used to describe the relationship between phenotype (the visible expression of a gene) and genotype (the genetic constitution of an individual). See also: Gene; Genetics; Mendelism
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