GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Only i and iii
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Only ii and iii
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Only i
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All i, ii and iii
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Detailed explanation-1: -Some noncoding DNA regions, called introns, are located within protein-coding genes but are removed before a protein is made. Regulatory elements, such as enhancers, can be located in introns. Other noncoding regions are found between genes and are known as intergenic regions.
Detailed explanation-2: -The introns do not code for any protein and are removed from the mRNA before it is made into protein. The exons are the sequences that code for protein.
Detailed explanation-3: -Exons and introns make up the majority of the human genome’s protein-coding genes. Introns are essential for gene expression regulation, even though they do not encode protein. Hence Introns don’t code for amino acids.
Detailed explanation-4: -Introns are nucleotide sequences in DNA and RNA that do not directly code for proteins, and are removed during the precursor messenger RNA (pre-mRNA) stage of maturation of mRNA by RNA splicing.