Q. No.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 |
What is the number of phases in the cell cycle of a typical eukaryotic cell?
| 1. | 4 | 2. | 5 |
| 3. | 3 | 4. | 2 |
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Match the stage of meiotic cell division in column I with corresponding event in Column II and select the correct option from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A |
Metaphase I |
P |
Homologous chromosomes separate, sister chromatids remain associated |
|
B |
Anaphase I |
Q |
Centromere splits |
|
C |
Metaphase II |
R |
Bivalents align at the equatorial plate |
|
D |
Anaphase II |
S |
Microtubules from the opposite poles get attached to kinetochores of sister chromatids |
Codes:
|
A |
B |
C |
D |
|
|
1. |
P |
R |
S |
Q |
|
2. |
P |
R |
Q |
S |
|
3. |
R |
P |
Q |
S |
|
4. |
R |
P |
S |
Q |
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Recombination between homologous chromosomes is completed by the end of:
| 1. | Zygotene | 2. | Diplotene |
| 3. | Pachytene | 4. | Diakinesis |
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Microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids in:
| 1. | Metaphase I | 2. | Anaphase I |
| 3. | Metaphase II | 4. | Anaphase II |
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Match the following events that occur in their respective phases of cell cycle and select the correct option
| (a) | G1 phase | (i) | Cell grows and organelle duplication |
| (b) | S phase | (ii) | DNA replication and chromosome duplication |
| (c) | G2 phase | (iii) | Cytoplasmic growth |
| (d) | Metaphase in M-phase | (iv) | Alignment of chromosomes |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (i) | (ii) | (iii) | (iv) |
Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
| 1. | Anaphase | 2. | Telophase |
| 3. | Prophase | 4. | Metaphase |
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