Question

which statement is true about brca1 and brca2 genes?
these genes were discovered in 1953.
cancerous tumors often form on these genes.
people can be tested for mutations on these genes.
mutations of these genes lead to diabetes.

Explanation:

• Analyze each option:
• Option 1: BRCA1 and BRCA2 were discovered in the 1990s, not 1953 (1953 is related to DNA structure discovery), so this is false.
• Option 2: Tumors form in tissues, not on genes. Genes are part of cells, so this is false.
• Option 3: Genetic testing for BRCA1/2 mutations is a common medical test to assess breast/ovarian cancer risk, so this is true.
• Option 4: Mutations in BRCA1/2 are associated with cancer (breast, ovarian), not diabetes, so this is false.

Answer:

C. People can be tested for mutations on these genes.