Question 1:
Diagram 1 shows the stages of cell division.

(a)(i) Name the type of cell division as shown in Diagram 1. [1 mark]
 
(ii) Give reason to your answer in (a)(i). [1 mark]

(b) Arrange the stages of cell division P, Q, R and S in a correct sequence in the boxes given. [1 mark]

(c)(i) Name structure W. [1 mark]

(ii) How many structures W in each cell at stage P? [1 mark]

(d) What happens to structure W if exposed to radioactive radiation? [1 mark]


Answer:
(a)(i) Mitosis

(a)(ii) The daughter cells contain the same number of chromosomes as the parent cell.

(b)

(c)(i) Chromosome

(c)(ii) 46

(d) Mutation may occur

Question 2:
Diagram 2 shows a process of cell division. Chromosomes at stage B are not shown.

(a)(i) Name the process shown in Diagram 2. [1 mark]
 
(ii) State the importance of the process in (a)(i). [1 mark]

(b)(i) During stage C, the chromosomes line up on the equator.
   What happens to the chromosomes during this stage? [1 mark]
 
(ii) What is the effect of the process in (b)(i) on the offspring? [1 mark]

(c) In Diagram 2, draw the chromosome at stage B. [1 mark]

(d) How many daughter cells are produced at the end of Division II in Diagram 1? [1 mark]


Answer:
(a)(i) Meiosis

(a)(ii) Production of gametes

(b)(i) Crossing-over

(b)(ii) Variations

(c)

(d) 4 daughter cells are produced