Question

Which statement correctly distinguishes VNTR from coding DNA sequences?

• A. VNTRs code for essential enzymes
• B. VNTRs show high polymorphism among individuals
• C. VNTRs are present only in prokaryotes
• D. VNTRs undergo translation

Hint:

The variability in number of tandem repeats forms the basis of DNA fingerprinting.

Answer 1

The Correct Option is B

VNTR stands for Variable Number Tandem Repeats. These are short nucleotide sequences repeated many times in tandem arrangement. VNTRs are mainly located in non-coding regions of DNA and do not code for proteins or enzymes. The number of repeated units varies greatly from one individual to another. This variability or polymorphism makes VNTRs extremely useful in identification techniques. Applications of VNTR:
• DNA fingerprinting
• Paternity testing
• Forensic investigations
• Identification of individuals Since coding DNA sequences are comparatively conserved, they do not show the same degree of variation as VNTRs. Option analysis:
• Option (A): Incorrect because VNTRs are non-coding DNA sequences.
• Option (B): Correct because VNTRs show high polymorphism.
• Option (C): Incorrect because VNTRs are commonly studied in eukaryotes.
• Option (D): Incorrect because VNTRs are not translated into proteins. Hence: \[ \boxed{\text{(B)}} \]