Q. No.Given below is a schematic break-up of the phases/stages of the cell cycle
Which one of the following is the correct indication of the stage/phase in the cell cycle?
1.
B-Metaphase
2.
C-Karyokinesis
3.
D-Synthesis phase
4.
A-Cytokinesis
When synapsis is complete all along the chromosome, the cell is said to have entered a stage called
| 1. | Zygotene | 2. | pachytene |
| 3. | diplotene | 4. | diakinesis. |
Which of the following is not a characteristic of meiosis?
| 1. | It involves two stages of DNA replication one before meiosis-I and another before meiosis-II |
| 2. | It involves recombination and crossing over |
| 3. | Sister chromatids separate during anaphase- II |
| 4. | Nuclear membrane disappears during prophase. |
Identify the correct matched pair.
| 1. | Segregation-Metaphase ll |
| 2. | Significance of meiosis-production of genetically similar cells |
| 3. | Exchange of genetic material- DIakinesis |
| 4. | Anaphase ll of meiosis-Centromeric division |
The exchange of segments of non-sister chromatids between chromosomes of a homologous pair termed as
| 1. | transformation |
| 2. | translocation |
| 3. | crossing over |
| 4. | chromosomal aberration |
What is the correct sequence of the steps given here ? Also work out the process depicted in the steps.
| i. | Homologous chromosomes move toward opposite poles of the cell; chromatids do not separate |
| ii. | Chromosomes gather together at the two poles of the cell and the nucleare membranes reform |
| iii. | Homologous chromosomes pair and exchange segments |
| iv. | Homologous chromosomes align on a central plate |
| v. | The haploid cells separate completely |
| 1. | The correct sequence is III → IV → I → II → V and the process is meiosis-I |
| 2. | The correct sequence is II → I → V → IV → III and the process is mitosis |
| 3. | The correct sequence is IV → I → III → II → V and the process is meiosis-I |
| 4. | the correct sequence is II → V → IV → I → II and the process is mitosis |
During meiosis, the sister chromatids separate during:
1. Anaphase II
2. Anaphase I
3. The S phase
4. Synapsis
Chromosomes decondense into diffuse chromatin:
1. At the end of telophase
2. At the beginning of prophase
3. At the end of interphase
4. At the end of metaphase
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