General
✓✗Match the stages of meiosis in Column I to their characteristic features in Column II.
Select the correct option.
| Column I | Column II |
| P. Pachytene | (i) Pairing of homologous chromosomes |
| Q. Metaphase I | (ii) Terminalisation of chiasmata |
| R. Diakinesis | (iii) Crossing over takes place |
| S. Zygotene | (iv) Chromosomes align at equatorial plate |
- P-(i), Q-(iv), R-(ii), S-(iii)
- P-(ii), Q-(iv), R-(iii), S-(i)
- P-(iii), Q-(iv), R-(ii), S-(i)
- P-(iv), Q-(iii), R-(ii), S-(i)
General
✓✗Spindle fibres unite with which structure of chromosomes?
- Chromomere
- Centriole
- Kinetochore
- Chromocentre
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Metaphase is the best stage to study chromosome morphology.
Reason (R): At metaphase, condensation of chromosomes is complete.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Metaphase is the best stage to study chromosome morphology.
Reason (R): At metaphase, condensation of chromosomes is complete.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗During leptotene, the chromosomes
- separate except at the sites of chiasmata
- become gradually visible under the light microscope
- pair with their homologues to form bivalents
- undergo crossing over at recombination nodules
General
✓✗The chromatids move towards the poles in anaphase mainly because
- the nuclear envelope pulls them
- the spindle fibres (microtubules) attached to their kinetochores shorten
- the nucleolus moves them
- the cell plate pushes them apart
General
✓✗The stage between the two meiotic divisions is called
- interphase with S phase
- diakinesis
- karyokinesis
- interkinesis
General
✓✗Arrange the following events of mitosis in the correct order.
A. Chromosomes align at the metaphase plate
B. Nuclear envelope reforms
C. Chromatin condenses
D. Chromatids move to opposite poles
A. Chromosomes align at the metaphase plate
B. Nuclear envelope reforms
C. Chromatin condenses
D. Chromatids move to opposite poles
- D, C, A, B
- C, A, D, B
- A, C, D, B
- C, D, A, B
General
✓✗When paternal and maternal chromosomes exchange their materials with each other in cell division, the event is called
- crossing over
- bivalent forming
- dyad forming
- synapsis
General
✓✗Arrange the following stages of meiosis in order: (A) Anaphase I, (B) Interkinesis, (C) Metaphase II, (D) Diakinesis, (E) Telophase I.
- D, A, B, E, C
- D, A, E, B, C
- A, D, E, B, C
- D, E, A, B, C
General
✓✗In the oocytes of some vertebrates, which substage of prophase I can last for months or years?
- Diplotene
- Leptotene
- Diakinesis
- Pachytene
General
✓✗Pairing of homologous chromosomes and recombination between them occur in
- mitosis
- meiosis I
- interkinesis
- meiosis II
General
✓✗Which of the following is a correct statement about interphase?
- It lasts less than 5 per cent of the cell cycle.
- It includes cell growth and DNA replication.
- The nuclear envelope disappears during it.
- Chromosomes separate during it.
General
✓✗How many of the following events occur in meiosis but not in mitosis?
Synapsis, crossing over, splitting of centromeres, formation of chiasmata, separation of homologous chromosomes, condensation of chromosomes
Synapsis, crossing over, splitting of centromeres, formation of chiasmata, separation of homologous chromosomes, condensation of chromosomes
- Four
- Three
- Six
- Five
General
✓✗Anaphase II begins with
- the simultaneous splitting of the centromere of each chromosome
- terminalisation of chiasmata towards the ends
- pairing of homologous chromosomes along their length
- separation of homologous chromosomes of each bivalent
General
✓✗At the end of telophase II and cytokinesis, the number of chromatids in each daughter cell per chromosome is
- zero
- four
- one
- two