Question

What is true of polytene chromosome?

• A. They are in permanent prophase
• B. They show chiasmata
• C. Lateral loops occur at most places
• D. They are bivalents

Answer 1

The correct option is A They are in permanent prophase

Polytene chromosomes are giant chromosomes also called salivary chromosomes as it was found in the salivary gland of Chironomus and Drosophila. Polytene chromosomes are formed by somatic pairing of homologous chromosomes followed by their repeated replication or endomitosis. They are in permanent prophase. The salivary gland cells of insect larva seldom divide and degenerate during the development of the adult organism.

So A is the correct option.