Cell Cycle and Cell Division

Multiple Choice Questions

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During meiosis crossing over occurs at

  • pachytene

  • zygotene

  • leptotene

  • diakinesis

A.

pachytene

During pachytene stage, crossing over takes place. It is exchange of equal segments of non-sister chromatids belonging to homologous chromosomes. The chromosome pair (i.e. bivalent) consists of four chromatids and thus crossing over takes place at four stranded stage.

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    During mitosis nuclear membrane disappears at

    • early prophase

    • late prophase

    • metaphase

    • anaphase

    Answer

    Stages in proper sequence of prophase- I are

    • zygotene, leptotene, pachytene, diakinesis

    • leptotene, zygotene, pachytene, diplotene and diakinesis

    • eptotene, pachytene, zygotene, diakinesis and diplotene

    • diplotene, diakinesis, pachytene, zygotene and leptotene

    Answer

    Spindle fibres of mitotic cell are made up of

    • tubulin

    • actin

    • myosin

    • collagen

    Answer

    Match the item in column I with those in column II and the choose the correct answer.

    Column I Column II
    A. Mitosis 1. Occurs in diploid cells only
    B. Meiosis 2. Occurs in both haploid and diploid cells
      3. Daughter and parent cells have same chromosome numbers
      4. Synapsis of homologous chromosomes.

    • A- 1; B- 2

    • A- 2; B- 3

    • A- 3; B- 4

    • A- 4; B- 1

    Answer
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    The stage of cell cycle when cell has undergone differentiation is :

    • G0

    • G1

    • G3

    • G4

    Answer

    Which of the followings does not occur in the interphase of eukaryotic cell division?

    • Increase of ATP synthesis

    • Increase of DNA synthesis

    • Increase of RNA synthesis

    • Reduction in cell size

    Answer

    During meiosis crossing over occurs between which part of homologous chromosome ?

    • Sister chromatids

    • Non-sister chromatids

    • Genes

    • Alleles

    Answer

    In cell cycle, during, which phase chromosomes are arranged in equatorial plate ?

    • Metaphase

    • Anaphase

    • Telophase

    • Prophase

    Answer
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    In synapsis two homologous chromosomes are connected at

    • centromeres

    • chromomeres

    • telomeres

    • none of these

    Answer
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