In von Willebrand disease, which is either autosomal recessive or autosomal dominant, clotting time slows and the person bruises and bleeds easily. Not everyone who inherits the disease genotype actually develops the phenotype. Affected individuals have differing degrees of difficulty in blood clotting. This condition is
A. completely penetrant, variably expressive, and not genetically heterogeneic.
B. completely penetrant, invariably expressive, and not genetically heterogeneic.
C. incompletely penetrant, variably expressive, and genetically heterogeneic.
D. pleiotropic and genetically heterogeneic.
Answer: C
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