Penetrance

penetrance
the percentage of individuals of a specific genotype that express an expected phenotype
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Penetrance The probability of a gene or genetic trait being expressed. "Complete" penetrance means the gene or genes for a trait are expressed in all the population who have the genes.
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Penetrance
Term coined by Voigt (1926) for the percentage with which a dominant or homozygous recessive gene expresses itself in the phenotype. Qualitative concept of gene expression. It depends both on genotype and environment.
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penetrance
In genetics, the proportion of individuals with a particular genotype that show the phenotype ascribed to that genotype.
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Penetrance: Refers to the proportion of individuals heterozygous for a given dominant allele that express the phenotype of that dominant allele.
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Marfan's Syndrome is associated with incomplete penetrance, therefore not all persons carrying the mutation develop the disease.
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Incomplete penetrance -- the gene for a condition is present, but not obviously expressed in all individuals in a family with the gene.
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resulting from a given genotype (cystic fibrosis, for example, may have a variable degree of severity). This is different from
pleiotropy
which refers to a variety of different phenotypes resulting from the same genotype, or from penetrance.
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