The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because
These are fused
These are much longer in size
These are easy to stain
They have endoreduplicated chromosomes
Genes which are located on the same chromosome are
Polytene chromosomes were first observed by
The total number of nitrogenous bases in human genome is estimated to be about
Splicing is necessary for preparing a mature transcript and its movement to cytoplasm. It requires