Q. No.Humans have a haploid chromosome number n = 23. How many tetrads will be formed during meiosis?
| 1. | 23 | 2. | 46 |
| 3. | 69 | 4. | 92 |
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
In meiosis, DNA replication occurs:
1. Only once before Meiosis I
2. Only once before Meiosis II
3. Twice, once before meiosis I and once during interkinesis
4. Twice, once before meiosis I and once during anaphase I of meiosis I
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Cells at the end of prophase of mitosis, when viewed under the microscope, do not show:
I. Golgi complexes
II. Endoplasmic reticulum
III. Nucleolus
IV. Nuclear envelope
1. Only I and II are correct
2. Only III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
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| COLUMN I | COLUMN II | ||
| A. | Zygotene | P. | Crossing over |
| B. | Pachytene | Q. | Synapsis |
| C. | Diplotene | R. | Terminalization of chiasmata |
| D. | Diakinesis | S. | Appearance of chiasmata |
| A | B | C | D | |
| 1. | Q | P | S | R |
| 2. | P | Q | S | R |
| 3. | P | Q | R | S |
| 4. | Q | P | R | S |
The phase of mitosis in which the spindle fibers break apart, two new nuclear membranes begin to form, and the chromosomes disperse into chromatin is
| 1. | metaphase | 2. | telophase |
| 3. | anaphase | 4. | prophase |
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Consider the given two statements:
| I: | Meiosis is responsible for maintaining the chromosome number across generations in sexually reproducing organisms. |
| II: | Meiosis results in reduction of chromosome number by half in the daughter cells. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Identify the correct statement regarding meiosis amongst the following:
I. Meiosis involves two sequential cycles of nuclear and cell divisions but only a single cycle of DNA replication.
II. Meiosis II is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase.
III. Meiosis involves pairing of bivalents and recombinations between them.
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II and III |
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The complex formed by a pair of synapsed homologous chromosomes is called
| 1. | Equatorial plate | 2. | Kinetochore |
| 3. | Bivalent | 4. | Axoneme |
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