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Question
In which animal cells polytene chromosomes are noticed?
In which animal cells polytene chromosomes are noticed?
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Solution
The correct option is A Drosophila
- Polytene chromosomes were originally observed in the salivary glands of Chironomus midges but the hereditary nature of these structures was confirmed after they were studied in Drosophila melanogaster.
- The giant polytene chromosomes from Drosophila third instar larval salivary glands provide an important model system for studying the architectural changes in chromatin morphology associated with the process of transcription initiation and elongation.
- In this tissue, the chromosomes undergo many rounds of replication in the absence of cell division giving rise to approximately 1000 copies.
- The DNA remains aligned after each replicative cycle resulting in greatly enlarged chromosomes.
Thus, the correct answer is option D.
- Polytene chromosomes were originally observed in the salivary glands of Chironomus midges but the hereditary nature of these structures was confirmed after they were studied in Drosophila melanogaster.
- The giant polytene chromosomes from Drosophila third instar larval salivary glands provide an important model system for studying the architectural changes in chromatin morphology associated with the process of transcription initiation and elongation.
- In this tissue, the chromosomes undergo many rounds of replication in the absence of cell division giving rise to approximately 1000 copies.
- The DNA remains aligned after each replicative cycle resulting in greatly enlarged chromosomes.
Thus, the correct answer is option D.
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