- The given figure is a schematic
break-up of the phases/stages
of cell cycle. Which one of the
following is the correct indication of
the stage/phase in the cell cycle?
(a) C - karyokinesis
(b) D - synthetic phase
(c) a - cytokinesis
(d) b - metaphase - When synapsis is complete the cell is said to have entered a
stage called
(a) zygotene (b) pachytene
(c) diplotene (d) diakinesis. - Crossing over occurs in
(a) non-sister chromatids of homologous chromosome at
two stranded stage
(b) non-sister chromatids of homologous chromosome at
four stranded stage
(c) sister chromatids of homologous chromosome at two
stranded stage
(d) sister chromatids of homologous chromosome at four
stranded stage. - If a cell contains 36 chromosomes, what will be the number
of chromosomes in each of the 4 daughter cells resulting
from meiosis?
(a) 36 (b) 18
(c) 9 (d) none of these - The number of mitotic cell division required to produce 256
cells from single cell would be
(a) 10 (b) 12
(c) 6 (d) 8 - During which stage of meiosis, synaptonemal complex is
formed?
(a) Pachytene (b) Diplotene
(c) Diakinesis (d) Zygotene - Chiasmata formation takes place during
(a) prophase I (b) metaphase I
(c) anaphase II (d) telophase I. - During meiosis I, the bivalent chromosomes clearly appear
as tetrads during
(a) diakinesis (b) diplotene
(c) leptotene (d) pachytene. - Select the correct option with respect to mitosis.
(a) Chromatids separate but remain in the centre of the cell
in anaphase.
(b) Chromatids start moving towards opposite poles in
telophase.
(c) Golgi complex and endoplasmic reticulum are still visible
at the end of prophase.
(d) Chromosomes move to the spindle equator and get
aligned along equatorial plate in metaphase.
16. Select the correct match.
(a) S phase – DNa replication
(b) Zygotene – Synapsis
(C) Diplotene – Crossing over
(D) Meiosis – both haploid and diploid cells
(e) Gap-2 phase – Quiescent stage
(a) a and b (b) C and D
(c) C and e (d) a, C and e
17. find the correctly matched pairs and choose the correct
option.
a. Leptotene – The chromosomes become
invisible
b. Zygotene – Pairing of homologous
chromosomes
C. Pachytene – Dissolution of the synaptonemal
complex takes place
D. Diplotene – bivalent chromosomes appear as
tetrads
e. Diakinesis – Terminalisation of chiasmata takes
place
(a) a and b are correct. (b) b and D are correct.
(c) b and e are correct. (d) b and C are correct.
18. Which of the following events are not characteristic features
of telophase?
a. Chromosome material condenses to form compact
mitotic chromosomes.
b. Nucleolus, Golgi complex and er reform.
C. Nuclear envelope assembles around the chromosome
clusters.
D. Centromeres split and chromatids separate.
e. Chromosomes cluster at opposite, spindle poles and
their identity as discrete elements is lost.
(a) a, b and D only (b) a and D only
(c) b and C only (d) C, D and e only
19. a stage in mitosis that starts towards the middle of anaphase
and is completed with the telophase is
(a) cytokinesis (b) karyokinesis
(c) crossing over (d) interkinesis.
20. Which of the following statements is incorrect about G 0
phase?
(a) Mitosis occurs after G 0 phase.
(b) biocatalysts can be used to exit G 0 phase.
(c) Cell volume keeps on increasing during this phase.
(d) Cell metabolism occurs continuously in G 0 phase.
ANSWER KEY
- (d) 2. (d) 3. (d) 4. (a) 5. (a)
- (a) 7. (b) 8. (b) 9. (b) 10. (b)
- (d) 12. (d) 13. (a) 14. (d) 15. (d)
- (a) 17. (c) 18. (b) 19. (a) 20. (a)