An Allele Known as BRCA1 Is Often Found in Women

An allele known as BRCA1 is often found in women with breast and ovarian cancer.However,some women develop these cancers and do not have the BRCA1 allele.In addition,some women who have BRCA1 never develop breast or ovarian cancer.How can this be explained?

A) This must be an example of pleiotropy.
B) These types of cancers are in no way associated with specific alleles.
C) Something other than the gene must factor into whether cancer develops.
D) The BRCA1 allele must be dominant.

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