Statement I: | In male honeybees, haploid cells divide by mitosis. |
Statement II: | Higher plants show mitotic divisions only in diploid cells. |
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is incorrect. |
3. | Statement I is correct and Statement II is correct. |
4. | Statement I is incorrect and Statement II is correct. |
Statement I: | The nuclear membrane and nucleolus reappear. |
Statement II: | The chromosomes reach the extremely extended state of the interphase nucleus. |
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is incorrect. |
3. | Statement I is correct and Statement II is correct. |
4. | Statement I is incorrect and Statement II is correct. |
Statement I: | At Metaphase I the chromosomes align at the equator and the microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids. |
Statement II: | At metaphase II the bivalent chromosomes align on the equatorial plate and microtubules from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes. |
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is incorrect. |
3. | Statement I is correct and Statement II is correct. |
4. | Statement I is incorrect and Statement II is correct. |
Which of the following does not take place during telophase of mitosis?
1. | Chromosomes become discrete. |
2. | Nuclear envelope reforms. |
3. | Chromosomes cluster at opposite spindle poles. |
4. | Nucleolus, endoplasmic reticulum, and Golgi complex reform. |
A: | DNA replication begins in the nucleus |
B: | centriole duplicates in the cytoplasm |
1 | A – Interphase | B – Prophase |
2 | A – S – phase | B – Telophase |
3 | A – Synthetic phase | B – Gap 2 phase |
4 | A – Interphase | B – Anaphase |
I: | terminalisation of chiasmata |
II: | decondensation of chromosomes |
III: | assembly of the meiotic spindle |
Assertion (A): | Metaphase is the stage at which morphology of chromosomes is most easily studied. |
Reason (R): | At this stage, metaphase chromosome is made up of two sister chromatids, which are held together by the centromere. |
1. | (A) is True; (R) is False |
2. | Both (A) and (R) are True and (R) correctly explains (A) |
3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
4. | (A) is False; (R) is True |