A dominant allele does not express itself in every person that contains it; occasionally parents without the characteristic have children that show the characteristic. This statement represents a feature known as

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Penetrance refers to the proportion of individuals carrying a particular variant of a gene (allele) that also express an associated trait (phenotype). If a dominant allele does not express itself in every person that contains it, it is an example of incomplete penetrance. This means that even though an individual has the allele, the phenotype might not be expressed, which aligns with the scenario described.

A Dominant Allele Does Not Express Itself in Every Person