Answer:
Functional mRNA of structural genes need
not always include all of its exons. This alternate splicing of exons is sex-specific,
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 everyprotein/isoprotein. Such an
extravagancy has been avoided in natural phenomena by way of alternate
splicing.
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