Question

What is it that forms the basis of DNA fingerprinting?

• A. The relative difference in the DNA occurrence in blood, skin and saliva
• B. The relative amount of DNA in the ridges and grooves of the fingerprints.
• C. The relative proportions of purines and pyrimidines in DNA
• D. Satellite DNA occurring as highly repeated short DNA segments

Answer 1

The correct option is D

Satellite DNA occurring as highly repeated short DNA segments

The correct option is D.

Explanation for Correct option:

1. VNTRs are a major source of the RFLP genetic marker, which is employed in genome linkage analysis.
2. The VNTRs create a banding pattern that is unique to each individual.
3. The gene VNTR is used in forensics, DNA fingerprinting, and other genetics, biology studies.

Explanation for Incorrect option:

Option A:
There is very small difference in sequence of DNA between two individuals. It can be differentiated in all the samples such as skin, blood and saliva.
Option B:
The usage of RFLPs is the oldest of the two DNA fingerprinting techniques outlined here. The RFLP methodology necessitates a significant DNA (> 25 ng) that is relatively undamaged.
Option C:
The proportion of purines and pyrimidines is mostly same in all the individual.
Final answer: Satellite DNA occurring as highly repeated short DNA segments is the basics of DNA fingerprinting.