Polytene chromosomes are formed by

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(A) Polytene chromosomes are giant chromosomes that are formed through a process called endoreduplication (or endomitosis).In this process,the $DNA$ u

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Endoreduplication of chromosomes

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(A) Polytene chromosomes are giant chromosomes that are formed through a process called endoreduplication (or endomitosis).In this process,the $DNA$ undergoes multiple rounds of replication without the cell dividing (cytokinesis).As a result,many copies of the chromatids remain attached to each other,forming a thick,banded structure known as a polytene chromosome.These are commonly observed in the salivary glands of $Drosophila$ larvae.

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