Question

a woman with a brca1 mutation
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.
will also have a mutation in brca2.
will definitely develop breast cancer.

Explanation:

• BRCA1 mutation is associated with an increased risk of breast cancer.
• It doesn't mean a low risk (so the second option is wrong).
• It can be inherited from either parent (so the third option is wrong).
• Having a BRCA1 mutation doesn't imply a BRCA2 mutation (so the fourth option is wrong).
• And having the mutation doesn't mean definite breast cancer development (so the fifth option is wrong).

Answer:

A. is at increased risk of developing breast cancer.