Structure of Chromosomes, Cell Cycle and Cell Division — Question 6
Back to all questionsGiven below is a diagram representing a stage during mitotic cell division in an animal cell. Examine it carefully and answer the questions which follow.
(a) Identify the stage. Give one reason in support of your answer.
(b) Name the cell organelle that forms the 'aster'.
(c) Name the parts labelled 1, 2 and 3.
(d) Name the stage that follows the one shown here. How is that stage identified?
(e) Mention two points of difference between mitosis and meiosis with regard to:
- The number of daughter cells produced.
- The chromosome number in the daughter cells.
(a) By observing the given figure we can say that it is the late prophase stage because the nuclear membrane and nucleolus have disappeared.
(b) Centrioles is the cell organelle that form the aster.
(c) The parts are as follows:
- 1 → Centromere
- 2 → Chromatids
- 3 → Spindle fibre
(d) The stage that follows the one shown here is Metaphase. In Metaphase, the centromeres of chromosomes are drawn to the equator by equal pull of two chromosomal spindle fibres that connects each centromere to the opposite poles, forming a metaphasic plate.
(e) Difference between mitosis and meiosis :
| Mitosis | Meiosis |
|---|---|
| It produce two daughter cells. | It produce Four daughter cells. |
| Full set of chromosomes is passed on to each daughter cell. This is the diploid (2n) number of chromosomes. | Only half the number of chromosomes is passed on to each daughter cell. This is the haploid (n) number of chromosomes. |