Q. No.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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In meiosis:
| 1. | A single round of DNA replication is followed by two sequential divisions with the chromosome number and DNA content getting reduced twice |
| 2. | A single round of DNA replication is followed by two sequential divisions with the chromosome number getting reduced twice and DNA content getting reduced once |
| 3. | A single round of DNA replication is followed by two sequential divisions with the chromosome number getting reduced once and DNA content getting reduced twice |
| 4. | A single round of DNA replication is followed by two sequential divisions with the chromosome number and DNA content getting reduced once |
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