Multiple choice

The salivary gland chromosomes in the diptera larvae, are useful in gene mapping because

  1. they have endoreduplicated chromosomes

  2. these are fused.

  3. these are easy to stain.

  4. these are much longer in size.
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A Correct answer
Explanation

  Polytene Chromosomes (Salivary Chromosomes) were discovered by Balbiani (1881) in the salivary glands of Chironomus tantans. Later they were found in salivary glands of many insect larvae including Drosophila. Polytene chromosomes are formed by somatic pairing of homologous chromosomes followed by their repeated replication or endomitosis. They are in permanent prophase.

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