Polytene chromosomes in salivary glands of Dr | vedclass

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(D) Polytene chromosomes are giant chromosomes formed by the process of endoreduplication or endomitosis.In this process,the $DNA$ replicates repeated

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All the above

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(D) Polytene chromosomes are giant chromosomes formed by the process of endoreduplication or endomitosis.In this process,the $DNA$ replicates repeatedly without the cell undergoing mitosis or cytokinesis.This leads to the formation of many parallel chromatids (chromonemata) that remain associated with each other,resulting in a thick,banded structure.Therefore,all the given options describe the mechanism of polytene chromosome formation.

List-$I$	List-$II$
$(a)$ $S$ phase	$(i)$ Proteins are synthesized
$(b)$ $G_2$ phase	$(ii)$ Inactive phase
$(c)$ Quiescent stage	$(iii)$ Interval between mitosis and initiation of $DNA$ replication
$(d)$ $G_1$ phase	$(iv)$ $DNA$ replication

Polytene chromosomes in salivary glands of Drosophila are formed as a result of

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