Q. No.Choose the odd one with respect to significance of meiosis
1.
Conservation of specific chromosome number of each species
2.
Increases genetic variability
3.
Able to regenerate part or whole of the organism
4.
Introduces new combination of traits
Mark the correct statement:
| 1. | The stage between two successive meiotic division is generally long lived |
| 2. | In plant cells, wall formation starts in the centre of the cell and grows outward to meet the existing lateral walls |
| 3. | Meiosis results in conservation of specific chromosomes number of each species across generations in asexually reproducing organisms |
| 4. | Telophase - I can last for months or year |
Select correct match (column I with column ll)
| Column l | Column II | ||
| a. | Bivalent as terad | (i) | Diplotene |
| b. | Chromatids separation | (ii) | Telophase l |
| c. | Terminalisation start phase | (iii) | Anaphase ll |
| d. | Nuclear membrane and nucleolus reappear | (iv) | Pachytene |
| 1. | a(iv), b(iii), c(i), d(ii) |
| 2. | a(iv), b(iii), c(ii), d(i) |
| 3. | a(iii), b(iv), c(i), d(ii) |
| 4. | a(ii), b(iii), c(i), d(iv) |
Bivalent align on the equator during
| 1. | Metaphase I of meiosis |
| 2. | Anaphase I of meiosis |
| 3. | Metaphase of mitosis |
| 4. | Anaphase of mitosis |
The figures below shows 3 phases of mitosis select the option given correct identification together with the correct event ?
| 1. | C- Telophase-Nuclear envelope assembles around the chromosome clusters |
| 2. | B- Anaphase-Segregation of homologous chromosomes. |
| 3. | A- Prophase-Chromosomes get fully condensed. |
| 4. | C- Metaphase-Condensation of chromatin to form chromosome |
Identify the symbols A, B and C in the figure given below
|
A |
B |
C |
|
|
(1) |
G0 |
Prophase |
Cytokinesis |
|
(2) |
Prophase |
Metaphase |
Telophase |
|
(3) |
G1 |
S |
G2 |
|
(4) |
Cytokinesis |
Prophase |
G0 |
1. (1)
2. (2)
3. (3)
4. (4)
At anaphase-II, sister chromatids move towards opposite poles of the cell by :
| 1. | Contraction in spindle fibre attached to kinetochores |
| 2. | Shorterning of microtubules attached to kinetochores |
| 3. | Lengthening of microtubules attached to kinetochores |
| 4. | Relaxation in spindle fibre attached to kinetochores |
Following are the events occurs during meiosis :
| (A) | Appearance of chiasmata |
| (B) | Synapsis |
| (C) | Assembly of meiotic spindle |
| (D) | Use of recombinase enzyme |
| 1. | ABCD |
| 2. | BDAC |
| 3. | DCBA |
| 4. | BCAD |
Chromatin condensation and movement of duplicated centriole towards opposite pole can be observed during -
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
Which phase of mitosis is essentially the reverse of prophase in terms of nuclear changes?
| 1. | S-phase | 2. | Anaphase |
| 3. | Telophase | 4. | Interphase |
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