AP Biology:  Celll Cycles and Cancer Recovery Test

Short Answer
Choose EITHER #1 or #2 to answer.  EVERYONE should answer #3 and #4.

	1.	
A.  Label I-V with the steps of the cell cycle.
B.  Draw a line on the graph that indicates the levels of CDK and Cyclin throughout the 2 cycles.
C.  Describe how cyclin and CDK function to regulate the cell cycle.

	2.	a. Describe what happens in each phase of the diagram above.
b. Put the checkpoints on the diagram and describe what happens at each checkpoint.
c. What is the G0?  Why isn’t it depicted on this diagram?

	3.	Describe how telomeres, specific genes, and environmental mutagens contribute to cancers.  What does pre-programed cell death have to do with the development of cancers?

	4.	a. On the diagram above, label each picture with the chromosome number at each step in the process of meiosis (2n, n).
b. Describe why the reduction in chromosome number happens during this process.
c. Describe the two reasons why this process contributes to genetic variation