Classify the statements below as describing proto-oncogenes or tumor suppressor genes. 1. some products of these genes normally function in repairing damaged dna. 2. these genes code for proteins that normally promote cell division. 3. mutations that increase activity of these genes may lead to cancer. 4. these genes code for proteins that normally prevent uncontrolled cell division. 5. loss-of-function mutations in these genes may lead to cancer.

The body is protected against harmful flu viruses by

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

Cells destroy body cells infected by a virus or bacteria.