Q. No.The stage during which separation of the paired homologous chromosomes begins is
1.
Pachytene
2.
Diplotene
3.
Diakinesis
4.
Zygotene
The enzyme recombinase is required at which stage of meiosis
1. Pachytene
2. Zygotene
3. Diplotene
4. Diakinesis
Crossing over that results in genetic recombination in higher organisms occurs between:-
1. Non-sister chromatids of a bivalent
2. Two daughter nuclei
3. Two different bivalents
4. Sister chromatids of a bivalent
The fruit fly has 8 chromosomes (2n) in each cell. During the interphase of mitosis, if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after the S phase?
| 1. | 4 | 2. | 32 |
| 3. | 8 | 4. | 16 |
Spindle fibres attach on to
1. kinetochore of the chromosome
2. centromere of the chromosome
3. kinetosome of the chromosome
4. telomere of the chromosome
| 1. | Complete disintegration of nuclear envelope takes place. |
| 2. | Chromosomes are highly condensed. |
| 3. | Metaphase chromosomes are made up of four sister chromatids held together by centromere. |
| 4. | Chromosomes lie at the equator of the cell. |
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Amount of cellular DNA increases during:
| 1. | Cytokinesis | 2. | Fertilisation |
| 3. | Mutation | 4. | Respiration |
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The stage of mitosis shown in the given diagram is:
 |
|
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Humans have a haploid chromosome number n = 23. How many tetrads will be formed during meiosis?
| 1. | 23 | 2. | 46 |
| 3. | 69 | 4. | 92 |
The human meiocyte shows 92 chromatids at the end of S phase. The number of centromeres in this cell will be:
| 1. | 23 | 2. | 46 |
| 3. | 69 | 4. | 92 |
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