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Polytene chromosomes, known for their large size, are made up of multiple aligned identical chromatids formed by repeated DNA replication without cell division. They were initially discovered by Balbiani in the salivary glands of Chironomus.

1. True
2. False
3. Cannot be determined
4. None of the above

Correct answer: True

Solution

Polytene chromosomes are indeed giant chromosomes formed by repeated rounds of DNA replication without cell division, leading to parallel chromatids. They were first observed by Balbiani in the salivary glands of Chironomus, making the statement true.

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