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Heredity and Variation

  • Nucleus
    • It controls all the cellular activities of cell.
    • It consists of the following.
      a. Nuclear membrane – It has perforations called nuclear pores.
      b. Nucleoplasm
      c. Nucleolus
    • Nucleolus is the site of ribosomal RNA formation.
    • Network of nucleoprotein fibres are called the chromatin.
    • Chromatin contains DNA, histones (basic proteins), non-histone proteins, and RNA.
    • Chromatin threads condense and organize to form chromosome.
    • The primary constriction in t…

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