In one family, the mother was diagnosed with breast cancer. Mom was tested to find out if she carried the gene for breast cancer (BRCA1). The
test was negative. In addition to lacking the gene for breast cancer, the
mother had not been exposed to any carcinogens. Select the biological
event below that is the most likely cause of your mother's breast cancer.
Mutations resulting from environmental factors
Mutations resulting from errors in DNA replication
New genetic combinations during cell division