Question

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

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

Answer 1

Answer: (D)

they have endoreduplicated chromosomes

Answer 2

Endoreduplication is a process where the chromosomes replicate without cell division, resulting in multiple copies of the same chromosome within a single nucleus. In dipteran larvae, the salivary gland chromosomes undergo endoreduplication, making them much larger and more extended than typical chromosomes. This characteristic allows for easier visualization and mapping of genes, as specific loci along these extended chromosomes can be identified and studied in detail.
So, the correct option is (D): they have endoreduplication chromosomes