Question

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

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

Answer 1

The correct option is A They have endoreduplicated chromosomes

The salivary gland chromosomes in the dipteran larvae are useful in gene mapping because they have endoreduplicated chromosomes which is involved in replication of the nuclear genome in the absence of mitosis, which leads to elevated nuclear gene content and polyploidy.

So, the correct answer is 'They have endoreduplicated chromosomes'.