Q. No.| 1. | the cell plate that represents the middle lamella |
| 2. | the cell plate that represents the primary cell wall |
| 3. | the cleavage furrow that represents the middle lamella |
| 4. | the contractile ring that represents the primary cell wall |
Humans have a haploid chromosome number n = 23. How many tetrads will be formed during meiosis?
| 1. | 23 | 2. | 46 |
| 3. | 69 | 4. | 92 |
Arrange the following events of meiosis in correct sequence
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
| 1. | (b), (c), (d), (a) | 2. | (b), (a), (d), (c) |
| 3. | (b), (a), (c), (d) | 4. | (a), (b), (c), (d) |
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Amount of cellular DNA increases during:
| 1. | Cytokinesis | 2. | Fertilisation |
| 3. | Mutation | 4. | Respiration |
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Consider the given two statements:
I. The kinetochore is essential for the chromosome segregation that is classically associated with mitosis and meiosis.
II. The kinetochore assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.
1. Both I and II are correct and II explains I
2. Both I and are correct but II does not explain I
3. I is correct and II is incorrect
4. Both I and II are incorrect
| 1. | Disappearance of nucleolus | 2. | Chromosome movement |
| 3. | Synapsis | 4. | Spindle fibres |
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Centromeres split leading to the separation of sister chromatids and the pulling of the separated sister chromatids to the opposite poles is seen in:
| I: | Mitotic anaphase |
| II: | Anaphase I |
| III: | Anaphase II |
| 1. | Only I |
| 2. | Only I and II |
| 3. | Only III |
| 4. | Only I and III |
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 |
| 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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Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
| 1. | Anaphase | 2. | Telophase |
| 3. | Prophase | 4. | Metaphase |
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