Molecular Genetics

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Chromosome appearance varies with stage of the cell cycle and with cell type.

• Interphase nuclei have distinct regions discernable by staining.
• Metaphase chromosomes
  • exhibit a condensed structure and
  • can be distinguished by size and chromosome banding.
• Polytene chromosomes occur in insect salivary gland cells.
• Lampbrush chromosomes are observed during amphibian development.