Multiple choice

Which of the following statements is true about polytene chromosome?

  1. They are inert cellular objects seen in drosophilla.

  2. Banding pattern of polytene chromosome is constant in individuals of one species.

  3. Puffs seen in polytene chromosomes are the sites of gene expression.

  4. Giant chromosomes are not useful in studies of gene expression system.

  5. Formation of giant chromosomes happen in adult fly.
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C Correct answer
Explanation

Puffs seen in polytene chromosomes are the sites of gene expression, where DNA strands are unwinded and actively take part in transcription.

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