Q. No.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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The mechanisms that contribute to the genetic variation arising from sexual reproduction include:
I. Independent assortment of chromosomes
II. Crossing over
III. Random fertilization
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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