Which Aspect Forms the Basis of DNA Fingerprinting?
Which Aspect Forms the Basis of DNA Fingerprinting?
Question: Which aspect forms the basis of DNA fingerprinting?
Answer
DNA fingerprinting, also called DNA profiling, is based on the fact that certain regions of DNA show considerable variation among individuals. These variable repetitive sequences can be used to distinguish one individual from another.
What Are VNTRs?
VNTRs (Variable Number Tandem Repeats) are repetitive DNA sequences in which the number of repeated units varies among individuals.
Because the number and arrangement of these repetitive sequences differ between individuals, they produce different DNA profiles.
Why Is DNA Fingerprinting Individual-Specific?
Most of the DNA sequence is similar among humans, but certain repetitive regions are highly variable. The differences in these regions create a characteristic DNA pattern for an individual.
Therefore, DNA fingerprinting can be used to compare biological samples from different individuals.
Applications of DNA Fingerprinting
- Forensic identification
- Establishing biological relationships
- Identification of individuals
- Parentage testing
- Population and genetic studies
Frequently Asked Questions
What is the basis of DNA fingerprinting?
DNA fingerprinting is based on the polymorphism or variation in repetitive DNA sequences, especially VNTRs.
What does VNTR stand for?
VNTR stands for Variable Number Tandem Repeats.
Why are VNTRs useful in DNA fingerprinting?
The number of repeated DNA units varies among individuals, producing variable DNA patterns that can help distinguish individuals.
Quick Revision
DNA Fingerprinting → DNA polymorphism → Repetitive DNA → VNTRs → Individual-specific DNA profile
Conclusion
The fundamental basis of DNA fingerprinting is the polymorphism found in repetitive DNA sequences. VNTRs are particularly useful because their copy number varies among individuals, allowing DNA profiles to be compared for identification and relationship studies.
