3.8.1 Cell Division (Structured Questions)


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

(a)(i) Name the type of cell division as shown in Diagram 1.
     (ii) Give reason to your answer in (a)(i).
(b) Arrange the stages of cell division P, Q, R and S in a correct sequence in the boxes given.

(c)(i) Name structure W.
    (ii) How many structures W in each cell at stage P?
(d) What happens to structure W if exposed to radioactive radiation?


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.
     (ii) State the importance of the process in (a)(i).
(b)(i) During stage C, the chromosomes line up on the equator.
           What happens to the chromosomes during this stage?
     (ii) What is the effect of the process in (b)(i) on the offspring?
(c) In Diagram 2, draw the chromosome at stage B.
(d) How many daughter cells are produced at the end of Division II in Diagram 1?


Answer:
(a)(i)
Meiosis

(a)(ii)
Production of gametes

(b)(i)
Crossing-over

(b)(ii)
Variations

(c)


(d)
4 daughter cells are produced

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