Differentiate between Exons and Introns.

Explanation

Functional mRNA of structural genes need not always include all of its exons This alternate splicing of exons is sex-specife, tissue-specific, and even developmental stage-specific. By such alternate splicing of exons, a single gene may encode for several isoproteins and/or proteins of similar class. In absence of such a kind of splicing, there should have been new genes for every protein/iso protein. Such an extravagancy has been avoided in natural phenomena by way of alternate splicing