Q. No.Amount of cellular DNA increases during:
1.
Cytokinesis
2.
Fertilisation
3.
Mutation
4.
Respiration
If you are provided with the root tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?
| 1. | Telophase | 2. | Anaphase |
| 3. | Prophase | 4. | Metaphase |
Spindle fiber unites with which structure of chromosomes:
1. Chromocenter
2. Chromomere
3. Kinetochore
4. Centriole
The best material for the study of mitosis in the laboratory:
| 1. | Anther | 2. | Root tip |
| 3. | Leaf tip | 4. | Ovary |
At which stage of the cell cycle does DNA replication occur:
1. G1 - phase
2. S - phase
3. G2 - phase
4. M - phase
In the somatic cell cycle:
| 1. | DNA replication takes place in S-phase |
| 2. | A short interphase is followed by a long mitotic phase |
| 3. | \(G_2\) phase follows the mitotic phase |
| 4. | In the \(G_1\) phase, DNA content is double the amount of DNA present in the original cell |
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 |
Centromere is required for:
| 1. | Movement of chromosomes toward poles |
| 2. | Cytoplasmic cleavage |
| 3. | Crossing over |
| 4. | Transcription |
Which of the following stages of meiosis involves division of centromere?
1. Anaphase II
2. Telophase II
3. Metaphase I
4. Metaphase II
© 2025 GoodEd Technologies Pvt. Ltd.