Question

a woman with a brca1 mutation
will also have a mutation in brca2.
will definitely develop breast cancer.
is at increased risk of developing breast cancer.
has a low risk of developing breast cancer.
must have inherited it from her mother, because of the link to breast cancer.

Explanation:

• BRCA1 and BRCA2 are separate genes. A mutation in BRCA1 does not imply a mutation in BRCA2.
• Having a BRCA1 mutation does not guarantee breast cancer development (so "will definitely develop" is wrong).
• BRCA1 mutations are associated with an increased risk of breast cancer (not low risk).
• BRCA1 mutations can be inherited from either parent, not just the mother.

Answer:

is at increased risk of developing breast cancer.