Question

5. Giant polytene chromosomes are
found in
O a) Egg of fruit fly
O b) Salivary gland of larvae of fruit fly
O c) Salivary gland of adult fruit fly
O d) All of the mentioned​

Answer 1

Structure. In insects, polytene chromosomes are commonly found in the salivary glands; they are also referred to as "salivary gland chromosomes". The large size of the chromosome is due to the presence of many longitudinal strands called chromonemata; hence the name polytene (many stranded).

Answer 2

Polytene chromosomes are present in secretory tissues of dipteran insects such as the Malpighian tubules of Sciara and also in protists, plants, mammals, or in cells from other insects. Some of the largest polytene chromosomes described thus far occur in larval salivary gland cells of the chironomid genus Axarus.