Q. No.| Assertion(A): | Mitosis does play a role in gamete formation. |
| Reason(R): | Haploid organisms divide by mitosis. |
| 1. | Both (A) & (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) & (R) are true but (R) is not the correct explanation of (A) |
| 3. | (A) is a true statement but (R) is false. |
| 4. | Both (A) and (R) are false statements. |
| Assertion (A): | Meiosis leads to recombinations of genes. |
| Reason (R): | Crossing over occurs in pachytene sub-stage of prophase I of meiosis. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
| A: | Tendency of parental combinations to remain together is called crossing over. |
| R: | Crossing over provides proof in favour of the linear arrangement of genes on chromosomes. |
| 1. | If both Assertion & Reason are true and the reason is the correct explanation of the assertion.. |
| 2. | If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. |
| 3. | If Assertion is a true statement but Reason is false.. |
| 4. | If both Assertion and Reason are false statements. |
Match each item in Column I with one item in Column II and chose your answer from the codes given below.
|
Column I (stage of prophase I) |
Column II (event) |
|
I. Zygotene II. Pachytene III. Diplotene IV. Diakinesis |
1. Crossing over 2. Chiasmata formation 3. Bivalent formation 4. Terminalization of chiasmata |
Codes:
I II III IV
1. 1 2 3 4
2. 2 1 4 3
3. 3 1 2 4
4. 3 2 1 3
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)
Match the following
| Column l | Column lI | ||
| a. | G1 phase | (i) | Longest phase of cell cycle |
| b. | M phase | (ii) | Synthesis of histone proteins |
| c. | S-phase | (iii) | Cell quiescence |
| d. | G0 phase | (iv) | Nuclear division |
1. a(i), b(i), c(iv), d(iii)
2. a(i), b(iv), c(ii), d(iii)
3. a(i), b(iv), c(iii), d(ii)
4. a(iv), b(iii), c(i), d(ii)
| List I | List II | ||
| A. | Pairing of homologous chromosomes | I. | Chiasmata |
| B. | Actual interchange of segments between two homologous chromosomes | II. | Synaptonemal complex |
| C. | Protein body formed between paired homologs | III. | Synapsis |
| D. | The cross shaped configuration visible between homologs | IV. | Crossing over |
1. A - (IV); B - (III); C- (I); D - (II)
2. A - (III); B - (IV); C- (I); D - (II)
3. A - (III); B - (IV); C- (II); D - (I)
4. A - (IV); B - (III); C- (II); D - (I)
Read the four statements (a-d) and choose the correct option.
| a. | Spindle fibers attach to kinetochores of chromosomes during metaphase. |
| b. | Cell growth results in disturbing the ratio between the nucleus and the cytoplasm. |
| c. | Pachytene stage is relatively short-lived compared to the leptotene. |
| d. | Interkinesis is a short-lived stage characterized by duplication of DNA. |
1 a, b & c are correct
2 Only c is incorrect
3 b & d are correct
4 a & b are correct
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 do not divide further exits G1-phase to enter a metabolically inactive stage. |
| I | II | III | IV | |
| 1. | T | F | F | F |
| 2. | F | T | T | T |
| 3. | F | F | T | T |
| 4. | T | F | F | T |
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
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