DAT Reading Comprehension Quiz
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ANALYTICAL REASONING
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PASSAGE
In genetics, penetrance refers to the proportion of individuals with a particular genotype that also express the associated phenotype. For some genetic disorders, penetrance is complete, meaning 100% of individuals with the disease-causing allele will develop the disease. However, for many conditions, penetrance is incomplete. For example, if a dominant allele for a disease has 80% penetrance, then 20% of the individuals who inherit the allele will not express the disease phenotype, even though they can still pass the allele to their offspring.
It can be inferred from the passage that in a family with a history of a disease caused by a dominant allele with incomplete penetrance,...
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