The salivary gland chromosomes in the dipteran larvae are useful in gene mapping because
These are much longer in size
These are easy to stain
These are fused
They have endoreduplicated chromosomes
The Barr body is observed in
Cytoplasmic inheritance always shows
A diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is
Jumping genes in maize were discovered by
Which phenomena leads to the variation in $DNA$