Q. No.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
1. Both I and II are true and II explains I
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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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Meiosis results in the formation of:
1. Two genetically identical diploid cells
2. Two genetically non identical diploid cells
3. Four genetically identical haploid cells
4. Four genetically non identical haploid cells
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Crossing over or recombination can be defined as:
| 1. | exchange of segments between sister chromatids of homologous chromosomes |
| 2. | exchange of segments between non sister chromatids of homologous chromosomes |
| 3. | exchange of segments between sister chromatids of heterologous chromosomes |
| 4. | exchange of segments between non sister chromatids of heterologous chromosomes |
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