Biology - Molecular Basis of Inheritance Question with Solution | TestHub
Which one of the following is INCORRECT about DNA fingerprinting?
Options:
Answer:
Solution:
DNA fingerprinting relies on the variation in the length of DNA fragments produced by restriction enzymes.
Restriction enzymes cut DNA at specific recognition sequences. Because the number of tandem repeats (VNTRs) between these recognition sites varies from person to person, the fragments produced are of unequal lengths. This phenomenon is known as Restriction Fragment Length Polymorphism (RFLP).
Therefore, the statement that DNA is cut into fragments of equal length is incorrect.
The other statements are correct: VNTRs are repeated sequences, their lengths vary among individuals, and DNA fragments are negatively charged, moving towards the positive pole (anode) during gel electrophoresis.
Answer: By using restriction enzymes, the DNA is cut into fragments of equal length.
