Ordinary Level exercise on cell division and mitosis
1.
Copy out this table and write in the correct meaning of each term:
Term
cell continuity
Meaning
chromosome.
haploid number
diploid number
Mitosis
Cancer
Meiosis
Multi- cellular
Fibre
1.
Having two copies of every chromosome is called …………………….
2.
Read the following description of mitosis. Arrange letters in the correct order.
(A) Chromosomes are pulled apart to opposite ends of the cell.
(B) The nuclear membrane disappears, and fibres are formed to which the
chromosomes attach.
(C) A nuclear membrane forms around each set of chromosomes and the cell divides in two.
(D) Just before the cell divides, chromosomes become visible in the nucleus (short, thick and
duplicated).
(E) Each new daughter cell now contains the same number of chromosomes as the parent
cell.
______________________________________________________________
3.
Draw a diagram of each stage above (A E) and write the matching phrase underneath each one.
4.
Give two causes of cancer that you can take steps to avoid.
5.
When mitosis happens in humans it allows us to grow. What is the function of mitosis
in a single celled organism?
6.
Do sperm contain a haploid or diploid number of chromosomes?
7.
The diagram shows a body cell of an animal at an early stage of mitosis.
8.
What is the diploid number of the animal in which this cell is found? ………..…………………
9.
When the cell division is completed how many new cells will there be? …..…………………
10.
If this cell were to divide by meiosis how many chromosomes would there be in each of the new
cells? ……………………………………………………………………………………
11.
Indicate whether the following are true (T) or false (F)
(a) The cells produced by meiosis are haploid.
(b) The cells produced by mitosis are identical.
(c) Meiosis is never involved in gamete formation
(d) Mitosis always produces four new cells.
(e) Meiosis gives rise to variation.
(f) Single-celled organisms use mitosis for reproduction.
12 . The diagram shows a cell undergoing cell division.
(a)
Genes are found on structure A. Name structure A.