Question

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

Explanation:

BRCA1 mutation is associated with an increased risk of breast cancer. A mutation in BRCA1 does not imply a BRCA2 mutation. Having a BRCA1 mutation does not mean a low - risk of breast cancer. It also does not mean definite development of breast cancer as other factors are involved. And it can be inherited from either parent.

Answer:

is at increased risk of developing breast cancer.