Which of the following stages of Meiosis I of Prophase I is not correctly matched with events occurring during that stage?
|
Stage |
Event |
1. |
Zygotene |
Pairing between homologous chromosomes |
2. |
Pachytene |
Crossing over between sister chromatids of homologous chromosomes |
3. |
Diplotene |
Tendency of recombined homologues to separate |
4. |
Diakinesis |
Terminalization of chiasmata |
Initiation of the assembly of mitotic spindle and the complete disintegration of the nuclear envelope can be observed in respectively
1. Prophase and anaphase I.
2. Metaphase and telophase.
3. Prophase and metaphase.
4. Metaphase and metaphase-I.
During cell cycle, events are under
1. Genetic control
2. Metabolic control
3. Cytoplasmic control
4. Mitochondrial control
1. | Pachytene | 2. | Diplotene |
3. | Diakinesis | 4. | Zygotene |
Match the following column I with column II.
Column I | Column II | ||
A. | Synapsis aligns homologous chromosomes | (i) | Anaphase II |
B. | Synthesis of RNA and protein | (ii) | Zygotene |
C. | Action of enzyme recombinase | (iii) | G2 - phase |
D. | Centromeres do not separate, but chromatids move towards opposite poles | (iv) | Anaphase I |
(v) | Pachytene |
1. A-(ii), B-(i), C-(iii), D-(iv)
2. A-(ii), B-(iii), C-(v), D-(iv)
3. A-(i), B-(ii), C-(v), D-(iv)
4. A-(ii), B-(iii), C-(iv), D-(v)
Consider the following four statements (I- IV) related to cell cycle, and select the correct option stating them as true (T) and false (F).
I. | Cell growth in terms of cytoplasmic increase is a continuous process. |
II. | Interphase is the phase of actual cell division. |
III. | The number of chromosomes doubles in S-phase. |
IV. | The cell that does not divide further exits G1-phase to enter a metabolically inactive stage. |
Options:
I II III IV
1. T F F F
2. F T T T
3. F F T T
4. T F F T
The microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes in
1. Metaphase - I
2. Prophase - I
3. Metaphase
4. Metaphase - II
By the end of Prophase II, chromosomes become
(1) Compact
(2) Loose
(3) Elongated
(4) Decondensed
When does Prophase II start usually?
(1) Chromosomes are fully elongated
(2) Before chromosomes are fully condensed
(3) Before chromosomes are fully elongated
(4) After chromosomes are fully elongated