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Cell Cycle and Cell Division — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYCell Cycle and Cell Division1 Mark
MCQ
Which of the events listed below is not observed during mitosis?
  • A
    Chromatin condensation.
  • B
    Movement of centrioles to opposite poles.
  • C
    Appearance of chromosomes with two chromatids joined together at the centromere.
  • ✓
    Crossing over.
✓

Answer

Correct option: D.
Crossing over.
Crossing over occurs in pachytene $($it is a phase of meiosis$-I)$. Crossing over is the exchange of genetic material $($genes$)$ between two homologous chromosomes. Crossing over is also an enzyme$-$mediated process and the enzyme involved is called recombinase. Crossing over leads to recombination of genetic material on the two chromosomes. Exchange of paternal and maternal chromosome material during pachytene is called crossing over.

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