Biology [5 Mark Question Answer]

Different steps of mitosis :

(a) Prophase

(b) Metaphase

(c) Early anaphase

(d) Anaphase

(e) Late anaphase

(f) Telophase

differences between mitosis and meiosis :

Mitosis	Meiosis
1. It takes place in somatic cells .	1. It takes place in germ or reproductive cells.
2. Chromosome number of parent cell is maintained.	2. Chromosome number of parent cell is reduced to half.
3. No crossing over and no chiasmata formation.	3. Crossing over and chiasmata formation occur.
4. Cytokinesis is necessary after telophase I.	4. Cytokinesis is not necessary after telophase I.
5. Two daughter cells are formed at the end.	5. Four daughter cells are formed at the and.

Different stages involved in meiosis:

(a) The diploid number of chromosomes appear

(b) Homologous chromosomes pair with each other , shorten and thicken

(c) Replication has occurred and the chromatics visible at equatorial plane

(d) Homologous chromosomes move apart except at the chissmata where the chromatids have exchanged portions

(e) A spindle forms and homologous chromosomes move to opposite ends taking the exchanged portions with them.

(f) Homologous chromosomes seperated but not enclosed in nuclear membranes

(g) Spindles form at right angles to the first one and the chromatids separate

(h) Four nuclei appear , each enclosing the hapoid number of chromosomes

(i) Cytoplasm divides to form four gametes.