1. Cell Division
Revision Questions

2. 1. What is the function of the nucleus? Answer
It is the control centre
of the cell.

3. 2.
What is another name for cell division?
Answer
Mitosis

4. 3.
Why is it important that new cells produced by mitosis have exactly the same number of chromosomes as the parent cell?
Answer
So that they have all the information on the chromosomes to be able to function normally.

5. 4. Answer What does the centromere do.?
It joins together the 2 chromatids of a chromosome.

6. 5.
Below are 4 stages in mitosis. Arrange them in the correct order :
A. Chromatids pulled apart
B. Chromosomes become visible
C. Nuclear membrane reforms
D. Chromosomes line up on equator of cell
Answer
B D A C

7. What name is given to the new cells produced as a result of mitosis?6.
Answer
Daughter cells

8. Certain forms of genes have harmful effects
Certain forms of genes have harmful effects. What condition is caused if the person has an extra chromosome on pair 21? 7.
Answer
Down’s Syndrome

9. A cell can divide to produce 2 daughter cells
A cell can divide to produce 2 daughter cells. Each daughter cell grows and then divides.
If each division takes 30 minutes, how many cells would there be after 6 hours? 8.
Answer
1024

10. 9.
If a parent cell had 5 pairs of chromosomes, how many chromosomes,in total would a cell have after 5 divisions?
Answer 10

11. 10.
Name the 2 strands of a chromosome which separate in mitosis.
Answer
Chromatids