Q.16:- Analyse the events during every stage of cell cycle and notice how the following two parameters change (i) Number of chromosomes (N) per cell (ii) Amount of DNA content (C)…

Q.15:- Can there be DNA replication without cell division?   Answer:- Yes. Endomitosis is the multiplication of chromosomes present in a set in nucleus without karyokinesis and cytokinesis result-ing in numerous…

Q.14:- Can there be mitosis without DNA replication in S phase?   Answer:- No, there cannot be mitosis without DNA replication in S phase because additional DNAs are required for…

Q.13:- Discuss with your teacher about (i) haploid insects and lower plants where cell-division occurs, and (ii) some haploid cells in higher plants where cell-division does not occur.   Answer:- (i) Male…

Q.12:- What is the significance of meiosis?   Answer:- The significance of meiosis is given below:- (i) Formation of gametes – Meiosis forms gametes that are essential for sexual reproduction. (ii)…

Q.10:- Distinguish anaphase of mitosis from anaphase I of meiosis.   Answer:- Anaphase of mitosis : It is the phase of shortest duration. APC (anaphase promoting complex) develops. It degenerates…

Q.11:- List the main differences between mitosis and meiosis.   Answer Mitosis Meiosis This type of division takes place in somatic cells This type of division takes place in gametic cells…

Q.9:- Find examples where the four daughter cells from meiosis are equal in size and where they are found unequal in size.   Answer:- During formation of male gametes (i.e., spermatozoa)…

Q.8:- How does cytokinesis in plant cells differ from that in animal cells?   Answer Cytokinesis Animal Cells The division of the cytoplasm takes place by cell plate formation. The division…

Q.7:- Describe the following: (a) synapsis (b) bivalent (c) chiasmata Draw a diagram to illustrate your answer.   Answer:- (a) Synapsis: During zygotene of prophase I stage homologou s chromosomes…