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Mutations in the human genes BRCA1 and BRCA2 are associated with an elevated risk of breast and ovarian cancer in women. However, not all women who have BRCA1 and BRCA2 mutations develop breast cancer.

Which of the following BEST describes this inheritance pattern?

A

Incomplete dominance.

B

Incomplete penetrance.

C

Variable expressivity.

D

Recessive inheritance.

E

Codominance.

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