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 ...
penetrance
In genetics, the proportion of individuals with a particular genotype that show the phenotype ascribed to that genotype.
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Penetrance The frequency with which individuals with the necessary genotype express symptoms of a genetic condition.
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.
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.
Penetrance An "ll or none" reference to clinical expression of a mutant gene.
Phage A virus for which the natural host is a bacterial cell.
Physical map A map of the locations of identifiable landmarks on DNA (e.g.
Is there variable expressivity and/or incomplete penetrance?
Is there a clear and accurate legend?
Are the symbols used correctly? Are unknown phenotypes indicated?
In the case of hemochromatosis, penetrance is incomplete, even for the classic HFE mutation, and is affected by gender, diet, and behaviors such as alcohol consumption.
Marfan's Syndrome is associated with incomplete penetrance, therefore not all persons carrying the mutation develop the disease.
Incomplete penetrance -- the gene for a condition is present, but not obviously expressed in all individuals in a family with the gene.
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.
 See also: Human, Gene, Genetics, Organ, Genome
  
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