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

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYCell Cycle and Cell Division2 Marks
Question
The diagram below represents the changes in the number of chromosomes during several Sun processes that occur in an animal cell.
  1. Name the process of cell division occurring at X and Y.
  2. State two differences in the behaviour of chromosomes between X and Y.
✓

Answer

  1. X-Mitosis. Y-Meiosis.
    1. In X, there is no association of homologous chromosomes, but in Y, homologous chromosomes pair up together to form bivalents during prophase-I.
    2. In X, there is no crossing over as there is no formation of chiasmata, but in Y, crossing over occurs at the chiasmata whereby some genes Pontos are swapped between homologous chromosomes.

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