Mitosis:- 1. In mitotic division, a single division results in two daughter cells. 2. Mitosis is known as equational division. This is because the daughter cells have the same diploid number of chromosomes as the parent. 3. Prophase is short and does not comprise any phase. 4. There is no pairing ofRead more
Mitosis:-
1. In mitotic division, a single division results in two daughter cells.
2. Mitosis is known as equational division. This is because the daughter cells have the same diploid number of chromosomes as the parent.
3. Prophase is short and does not comprise any phase.
4. There is no pairing of chromosomes, crossing-over, or chiasmata-formation during prophase.
5. Synaptonemal complex is not formed.
6. Anaphase involves the separation of the chromatids of each chromosome.
7. Mitosis plays a significant role in the healing, repair, and growth of a cell.
Meiosis:-
1. Meiotic division involves two successive divisions – meiosis I and meiosis II. These divisions result in four daughter cells.
2. Meiosis I is known as reductional division. This is because the chromosome number is reduced to half. Meiosis II is known as equational division. This is because the sister chromatids separate and the chromosome number remains the same.
3. Prophase I is very long and comprises 5 phases –leptotene, zygotene, pachytene, diplotene, and diakinesis.
4. In the zygotene stage of prophase, the pairing of chromosomes occurs. During pachytene, the crossing-over occurs. The chiasmata are formed in the diplotene stage.
5. Synaptonemal complex is formed during the zygotene stage of prophase I.
6. During anaphase I, the homologous chromosomes separate, while the chromatids remain attached at their centromeres. During anaphase II, the chromatids separate as a result of the splitting of the centromere.
7. Meiosis brings about variation and maintains the chromosome number from generation to generation.
(a) Spermatogenesis or the formation of sperms in human beings occurs by the process of meiosis. It results in the formation of four equal-sized daughter cells. (b) Oogenesis or the formation of ovum in human beings occurs by the process of meiosis. It results in the formation of four daughter cellsRead more
(a) Spermatogenesis or the formation of sperms in human beings occurs by the process of meiosis. It results in the formation of four equal-sized daughter cells.
(b) Oogenesis or the formation of ovum in human beings occurs by the process of meiosis. It results in the formation of four daughter cells which are unequal in size.
Cytokinesis in plant cells:- (i) The division of the cytoplasm takes place by cell plate formation. (ii) Cell plate formation starts at the centre of the cell and grows outward, toward the lateral walls. Cytokinesis is animal cells:- (i) The division of the cytoplasm takes place by cleavage. (ii) ClRead more
Cytokinesis in plant cells:-
(i) The division of the cytoplasm takes place by cell plate formation.
(ii) Cell plate formation starts at the centre of the cell and grows outward, toward the lateral walls.
Cytokinesis is animal cells:-
(i) The division of the cytoplasm takes place by cleavage.
(ii) Cleavage starts at the periphery and then moves inward, dividing the cell into two parts.
(i) Metaphase (ii) Anaphase (iii) Zygotene of meiosis I (iv) Pachytene of meiosis I For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/
(i) Metaphase
(ii) Anaphase
(iii) Zygotene of meiosis I
(iv) Pachytene of meiosis I
Mitosis is the process of cell division wherein the chromosomes replicate and get equally distributed into two daughter cells. The chromosome number in each daughter cell is equal to that in the parent cell, i.e., diploid. Hence, mitosis is known as equational division. For more answers visit to webRead more
Mitosis is the process of cell division wherein the chromosomes replicate and get equally distributed into two daughter cells. The chromosome number in each daughter cell is equal to that in the parent cell, i.e., diploid. Hence, mitosis is known as equational division.
List the main differences between mitosis and meiosis.
Mitosis:- 1. In mitotic division, a single division results in two daughter cells. 2. Mitosis is known as equational division. This is because the daughter cells have the same diploid number of chromosomes as the parent. 3. Prophase is short and does not comprise any phase. 4. There is no pairing ofRead more
Mitosis:-
1. In mitotic division, a single division results in two daughter cells.
2. Mitosis is known as equational division. This is because the daughter cells have the same diploid number of chromosomes as the parent.
3. Prophase is short and does not comprise any phase.
4. There is no pairing of chromosomes, crossing-over, or chiasmata-formation during prophase.
5. Synaptonemal complex is not formed.
6. Anaphase involves the separation of the chromatids of each chromosome.
7. Mitosis plays a significant role in the healing, repair, and growth of a cell.
Meiosis:-
1. Meiotic division involves two successive divisions – meiosis I and meiosis II. These divisions result in four daughter cells.
2. Meiosis I is known as reductional division. This is because the chromosome number is reduced to half. Meiosis II is known as equational division. This is because the sister chromatids separate and the chromosome number remains the same.
3. Prophase I is very long and comprises 5 phases –leptotene, zygotene, pachytene, diplotene, and diakinesis.
4. In the zygotene stage of prophase, the pairing of chromosomes occurs. During pachytene, the crossing-over occurs. The chiasmata are formed in the diplotene stage.
5. Synaptonemal complex is formed during the zygotene stage of prophase I.
6. During anaphase I, the homologous chromosomes separate, while the chromatids remain attached at their centromeres. During anaphase II, the chromatids separate as a result of the splitting of the centromere.
7. Meiosis brings about variation and maintains the chromosome number from generation to generation.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/
Find examples where the four daughter cells from meiosis are equal in size and where they are found unequal in size.
(a) Spermatogenesis or the formation of sperms in human beings occurs by the process of meiosis. It results in the formation of four equal-sized daughter cells. (b) Oogenesis or the formation of ovum in human beings occurs by the process of meiosis. It results in the formation of four daughter cellsRead more
(a) Spermatogenesis or the formation of sperms in human beings occurs by the process of meiosis. It results in the formation of four equal-sized daughter cells.
(b) Oogenesis or the formation of ovum in human beings occurs by the process of meiosis. It results in the formation of four daughter cells which are unequal in size.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/
How does cytokinesis in plant cells differ from that in animal cells?
Cytokinesis in plant cells:- (i) The division of the cytoplasm takes place by cell plate formation. (ii) Cell plate formation starts at the centre of the cell and grows outward, toward the lateral walls. Cytokinesis is animal cells:- (i) The division of the cytoplasm takes place by cleavage. (ii) ClRead more
Cytokinesis in plant cells:-
(i) The division of the cytoplasm takes place by cell plate formation.
(ii) Cell plate formation starts at the centre of the cell and grows outward, toward the lateral walls.
Cytokinesis is animal cells:-
(i) The division of the cytoplasm takes place by cleavage.
(ii) Cleavage starts at the periphery and then moves inward, dividing the cell into two parts.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/
Name the stage of cell cycle at which one of the following events occur: (i) Chromosomes are moved to spindle equator (ii) Centromere splits and chromatids separate (iii) Pairing between homologous chromosomes takes place (iv) Crossing over between homologous chromosomes takes place
(i) Metaphase (ii) Anaphase (iii) Zygotene of meiosis I (iv) Pachytene of meiosis I For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/
(i) Metaphase
(ii) Anaphase
(iii) Zygotene of meiosis I
(iv) Pachytene of meiosis I
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/
Why is mitosis called equational division?
Mitosis is the process of cell division wherein the chromosomes replicate and get equally distributed into two daughter cells. The chromosome number in each daughter cell is equal to that in the parent cell, i.e., diploid. Hence, mitosis is known as equational division. For more answers visit to webRead more
Mitosis is the process of cell division wherein the chromosomes replicate and get equally distributed into two daughter cells. The chromosome number in each daughter cell is equal to that in the parent cell, i.e., diploid. Hence, mitosis is known as equational division.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-10/