Gene mutations in either the BRCA1 or the BRCA2 genes are responsible for the majority of hereditary breast cancer in humans.
The proteins produced by the two genes migrate to the nucleus where they interact with other proteins, such as those produced by the tumour suppressor gene, p53 and the DNA repair gene, RAD51.
Which combination of gene activity is most likely to result in breast cancer?

1 )
A
2 )
B
3 )
C
D
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