(a) Identify the stage. Give a reason to support 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 this stage of mitosis.
How can this stage be identified?
(e) Mention two points of difference between mitosis and
meiosis with regard to:
(i) the number of daughter cells formed
(ii) the chromosome number in the daughter cells.
Answers
Answer:
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
It produce two daughter cells.
Meiosis - It produce Four daughter cells.
Mitosis - Full set of chromosomes is passed on to each daughter cell. This is the diploid (2n) number of chromosomes.
Meiosis - Only half the number of chromosomes is passed on to each daughter cell. This is the haploid (n) number of chromosomes
Explanation:
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
It produce two daughter cells.
Meiosis - It produce Four daughter cells.
Mitosis - Full set of chromosomes is passed on to each daughter cell. This is the diploid (2n) number of chromosomes.
Meiosis - Only half the number of chromosomes is passed on to each daughter cell. This is the haploid (n) number of chromosomes