1. Mitotic anaphase differs from metaphase in possessing
(a) same number of chromosomes and same number of chromatids
(b) half number of chromosomes and half number of chromatids
(c) half number of chromosomes and same number of chromatids
(d) same number of chromosomes and half number of chromatids
2. Colchicine is an inhibitory chemical which
(a) stops the functioning of centriole
(b) prevents attaching of centromeres with rays
(c) prevents the spindle formation in mitosis
(d) prevents the formation of equatorial plane
3. Amitosis is
(a) division involving formation of chromosome bridges
(b) division involving spindle formation
(c) division in which chromosomes are equally distributed
(d) deavageofnucleuswithoutrecognisablechromosome distribution
4. As compared to mitosis, in meiosis
(a) two replication cycle of DNA is followed by two divisions
(b) four diploid cells are formed
(c) every chromosome behaves independently
(d) genetic variabilities are introduced in daughter cells
5. Synaptonemal complex has a role in
(a) chromosome pairing
(b) chromosome movement
(c) chromosome segregation
(d) chromosome organization
6. When number of chromosomes is already reduced to half in the first reductional division of meiosis. What is the necessity of second mitotic division?
(a) The division is required for the formation of four gametes.
(b) The division ensures equal distribution of haploid chromosomes.
(c) The division ensures equal distribution of genes on chromosomes.
(d) The division is required for segregation of replicated, chromosomes
7. The number of chromosomes becomes half in
(a) anaphase I (b) anaphase II
(c) telophase I (d) telophase II.
8. At which phase of meiosis, the two cells, each with separated sister chromatids move towards opposite poles?
(a) Anaphase I (b) Anaphase II
(c) Metaphase I (d) Metaphase II
9. Meiosis differs from mitosis in that
(a) first division is reductional and second division is equational
(b) first division is equational and second division is reductional
(c) both divisions are reductional
(d) both divisions are equational
10. In which phase of cell division is oogonia arrested?
(a) Anaphase- II (b) Prophase-1
(c) Interphase (d) Both prophase-1 and II
11. In which of the following stage, the chromosomes are thin and like long threads ?
(a) Leptotene (b) Zygotene
(c) Pachytene (d) Diplotene
12. What letter indicates the end of meiosis I?
1. Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle?
(a) Decondensation from chromosomes, and reassembly of the nuclear lamina
(b) Transcription from chromosomes, and reassembly of the nuclear lamina
(c) Formation of the contractile ring, and formation of the phragmoplast
(d) Formation of the contractile ring, and transcription from chromosomes
2. 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
4. Meiosis in AaBb will result in gametes
(a) AB, ab (b) Aa, Bb
(c) AB,aB,Ab,ab (d) Aa, bb. (BHU 2001)
5. 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. (DPMT 2003)
6. Stages in proper sequence of prophase-l are
(a) zygotene, leptotene, pachytene, diakinesis and diplotene
(b) leptotene, zygotene, pachytene, diplotene and diakinesis
(c) leptotene, pachytene, zygotene, diakinesis and diplotene
(d) diplotene, diakinesis, pachytene, zygotene and leptotene.
(UP-CPMT 2000; Odisha 2002; BHU 2010)
7. Four phases of cell cycle are
(a) G1 —»S -» G2 —» M
(b) S —> G1 —> G2 —> M
(c) G1 —»G2 —»S —> M
(d) M —» G1 —» G2 —»S
(UP-CPMT 1998, 2010; AFMC 2010; CMC Vellore 2013)
8. How many mitotic divisions are required to produce 128 cells from a single cell ?
(a) 7 (b) 64
(c) 32 (d) 16
(AFMC 2002,2006; Odisha 2010)
9. 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 (AMU 2007)
10. The number of mitotic cell division required to produce 256 cells from single cell would be
(a) 10 (b) 12
(c) 6 (d) 8 (Karnataka 2007)
11. In a mammalian cell the longest and the most active phase of the cell cycle is
(a) S phase (b) G, phase
(c) G2 phase (d) M phase. (BHU 2010)
12. During which stage of meiosis, synaptonemal complex is formed ?
(a) pachytene (b) diplotene
(c) diakinesis (d) zygotene (UP-CPMT 2010)
13. Chiasmata formation takes place during
(a) prophase I (b) metaphase I
(c) anaphase II (d) telophase I. (AMU 2010)
14. Compare the statements A and B.
Statement A: Synthesis of DNA takes place in the S-phase of interphase.
Statement B: Every chromosome, during metaphase, has two chromatids.
Choose the correct description :
(a) Statement A is wrong and B is correct
(b) Statement A is correct and B is wrong
(c) Both the statements A and B are correct and A is the reason for B
(d) Both the statements A and B are correct and A is not the reason for B (Karnataka 2010)
15. During meiosis I, the bivalent chromosomes clearly appear as tetrads during
(a) diakinesis (b) diplotene
(c) leptotene (d) zygotene
(e) pachytene. (Kerala 2010)
16. In a diploid cell at which stage of cell cycle, the amount of DNA is doubled?
(a) G, and G2 phase (b) G0 phase
(c) S, G2 and M phase (d) S phase (AIIMS 2013)
17. 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.
(AIPMT Prelims 2011)
18. Syncytium formation occurs if
(a) karyokinesis is not followed by cytokinesis
(b) cytokinesis is not followed by karyokinesis
(c) no karyokinesis takes place
(d) both karyokinesis and cistokinesis are prevented.
19. 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 & B
(b) C & D
(c) C & E
(d) A, C & E
(e) A & D
20. The stage between two meiotic divisions is called
(e) diakinesis. (Kerala 2011)
21. 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 – Terminalization 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
(e) C and D are correct(Kerala 2012)
22. The given figure is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?
(a) Prophase-I during meiosis
(b) Prophase-ll during meiosis
(c) Prophase of mitosis
(d) Both prophase and metaphase of mitosis (AIPMT Prelims 2012)
23. 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
(e) A and B only (Kerala 2012)
24. 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. (AFMC 2012)
25. Microtubule depolymerizing drug such as colchicine is expected to
(a) inhibit spindle formation during mitosis
(b) inhibit cytokinesis
(c) allow mitosis beyond metaphase
(d) induce formation of multiple contractile rings. (AIIMS 2012)
26. Which of the following statements is incorrect about Go phase?
(a) Mitosis occurs after G0 phase.
(b) Biocatalysts can be used to exit G0 phase.
(c) Cell volume keeps on increasing during this phase.
(d) Cell metabolism occurs continuously in Go phase. (AIIMS 2012)
27. A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.
(a) Cytokinesis – Cell plate formed, mitochondria distributed between two daughter cells.
(b) Telophase – Endoplasmic reticulum and nucleolus not reformed yet.
(c) Telophase – Nuclear envelope reforms, Golgi complex reforms.
(d) Late anaphase – Chromosomes move away from equatorial plate, Golgi complex not present. (NEET 2012)
28. During the metaphase stage of mitosis, spindle fibres attach to chromosomes at
(b) both centromere and kinetochore
(c) centromere, kinetochore and areas adjoining centromere
(d) centromere. (NEET-Karnataka 2013)
29. A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics?
(a) Metaphase – Spindle fibers attached to kinetochores, centromeres split and chromatids separate.
(b) Metaphase – Chromosomes moved to spindle equator, chromosomes made up of two sister chromatids.
(c) Anaphase – Centromeres split and chromatids separate and start moving away.
(d) Late prophase – Chromosomes move to spindle equator. (NEET-Karnataka 2013)
30. In onion root tip during metaphase stage of mitosis the number of kinetochores will be
(a) 4 (b) 8
(c) 16 (d) 32 (AMU 2013)