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 |
Statement I: | In mitosis, chromosomal number in the progeny as well as in parents remains the same |
Statement II: | Mitosis takes place in gametes |
1. | Both statement I and statement II are correct |
2. | Both statement I and statement II are incorrect |
3. | Statement I is correct but statement II is incorrect |
4. | Statement I is incorrect but statement II is correct |
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. |
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: | Mitosis does play a role in gamete formation. |
R: | Haploid organisms divide by mitosis. |
1. | Both Assertion & Reason are true and the Reason is the correct explanation of the Assertion. |
2. | Both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion |
3. | Assertion is a true statement but Reason is false. |
4. | Both Assertion and Reason are false statements. |
Assertion(A): | Cell division, DNA replication, and cell growth have to take place in a coordinated way. |
Reason(R): | This well coordinated way ensures correct division and formation of progeny cells containing intact genomes. |
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. | (A) is False, but (R) is True. |