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Polythene chromosomes, first observed by EG Balbiani in 1881, are commonly found in the salivary glands of insects and are often referred to as salivary gland chromosomes. These chromosomes, which may also appear in other insect tissues, antipodal cells, endosperm cells, and suspensor cells, can grow up to 200 μm long and hold 1000 to 16000 times more DNA than typical somatic chromosomes. What is the primary importance of polythene chromosomes?

1. They play a role in gene amplification processes.
2. They facilitate the examination of chromosomal structures.
3. They are utilized in genetic research.
4. All of the above are correct.

Correct answer: All of the above are correct.

Solution

Polythene chromosomes are highly amplified and visible under a microscope, making them useful for studying chromosomal structure, gene amplification, and genetic studies. Thus, all the options are correct.

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