BRCA1 gene is located on chromosome:: (A) 17q21, (B) 13q12, (C) 12q13, (D) 21q17
Answer is A. Mutations in BRCA1 and BRCA2 are responsible for 80% to 90% of "single gene" familial breast cancers and about 3% of all breast cancers. BRCA1 is located on 17q21 BRCA2 is located on chromosome 13q12.