Studies have shown that 5%-10% of all breast cancers are related to mutations in BRCA1 and BRCA2. A logical conclusion from these data is that:
A)most women with breast cancer have mutations in one or both of these genes.
B)most women with breast cancer must have inherited the gene from their mother.
C)at least some breast cancers are caused by the environment or by genes other than BRCA1 and BRCA2.
D)not all mutations in BRCA1 and BRCA2 have been identified to account for the other 90%-95% of breast cancers.

Question

Quizplus · Accepted Answer

The fact that only 5%-10% of all breast cancers are related to mutations in BRCA1 and BRCA2 indicates that at least some breast cancers are caused by factors other than these genes, including environmental factors and other genetic mutations. It does not necessarily mean that most women with breast cancer have mutations in these genes, nor that inheritance is the only way these mutations are acquired. Additionally, it is possible that some mutations in BRCA1 and BRCA2 have not yet been identified, but this is not directly implied by the data presented.

Studies Have Shown That 5%-10% of All Breast Cancers Are