Giant chromosome is found in

The giant chromosome is found in Salivary gland chromosome of drosophila.
The giant chromosomes are very large compared to normal chromosomes. They are also called mega chromosomes.
They increase the cell volume and DNA content so it has multiple copies of genes that allow a high level of gene expression.
Polytene giant chromosomes are found in the cells of salivary glands of Drosophila. It helps produce a large amount of adhesive mucoprotein, a type of glue before pupation.