Q. No.All the following are significances of mitosis except:
1. Restoration of nuclear/cytoplasmic ratio
2. Growth of living organisms
3. Replacement of lost cells
4. Generation of genetic variation
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The key features of meiosis include all the following except:
| 1. | Pairing of heterologous chromosomes |
| 2. | Crossing over between non sister chromatids of homologous chromosomes |
| 3. | Four haploid cells produced at the end of the second division |
| 4. | Initiated after DNA replication in S phase |
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The correct chronology of stages of Prophase I is:
1. Leptotene – Zygotene – Pachytene – Diplotene – Diakinesis
2. Leptotene – Pachytene – Zygotene – Diplotene – Diakinesis
3. Leptotene – Zygotene – Pachytene – Diakinesis – Diplotene
4. Zygotene – Leptotene – Pachytene – Diakinesis – Diplotene
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Consider the given two statements:
| I: | Meiosis conserves a specific number of chromosomes across generations in sexually reproducing organisms |
| II: | Meiosis results in a reduction of chromosome number by half |
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true but II is false
4. I is false but II is true
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Identify the correct statement amongst the following:
| 1. | Crossing over occurs in prophase I of meiosis and metaphase of mitosis. |
| 2. | DNA replication occurs once prior to mitosis and twice prior to meiosis. |
| 3. | Both mitosis and meiosis result in daughter cells identical to the parent cells. |
| 4. | Karyokinesis occurs once in mitosis and twice in meiosis. |
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Which of the following stages of Prophase I of meiosis I can last for many months or years in certain vertebrate oocytes?
| 1. | Zygotene | 2. | Pachytene |
| 3. | Diplotene | 4. | Diakinesis |
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Males produce gametes by mitosis in:
| 1. | Honey bees | 2. | Grasshopper |
| 3. | Birds | 4. | Drosophila melanogaster |
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The paired homologues seen during zygotene of meiosis I are known as:
| 1. | Bivalent | 2. | Tetrad |
| 3. | Mitotic apparatus | 4. | Sister chromosomes |
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Which of the following is not a feature of diakinesis stage of prophase I of meiosis I?
| 1. | Terminalization of chiasmata |
| 2. | Meiotic spindle assembling to prepare separation of homologues |
| 3. | Decondensation of the chromatin |
| 4. | NEBD and disappearance of nucleolus |
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What would be true for comparison of Anaphase I and Anaphase II of meiosis?
| 1. | Centromere does not split in Anaphase I and homologues separate but centromere splits in Anaphase II and sister chromatids separate. |
| 2. | Centromere splits in Anaphase I and homologues separate but centromere does not split in Anaphase II and sister chromatids separate. |
| 3. | Paired homologues get attached to spindle from opposite poles in Anaphase I while sister chromatids of individual chromosomes get attached to spindle from opposite poles in Anaphase II. |
| 4. | Paired homologues get attached to spindle from opposite poles in Anaphase II while sister chromatids of individual chromosomes get attached to spindle from opposite poles in Anaphase I. |
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