Question

The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because

• A. These are fused.
• B. These are much longer in size.
• C. These are easy to stain.
• D. They have endoreduplicated chromosomes.

Answer 1

Answer: (D)

They have endoreduplicated chromosomes.

The salivary gland chromosomes in the dipteran larvae are useful in gene mapping because they have endoreduplicated chromosomes. Endoreplication (also referred to as endoreduplication or polytenization) is replication of the nuclear genome in the absence of cell division, which leads to elevated nuclear gene content and polyploidy.