Dna Fingerprinting
Mediumbiology
Variable number tandem repeats (VNTRs) are useful because they:
Select the correct option:
Solution
Incorrect! Answer:
Show length polymorphism
- Nature of VNTR: These are short sequences of DNA (satellite DNA) that repeat multiple times in tandem at specific locations on chromosomes.
- Polymorphism: The number of repeats varies significantly from person to person (except between monozygotic twins).
- Application: Because the number of repeats (and thus the length of the fragment) is different, comparing these length polymorphisms allows scientists to uniquely identify individuals.
- Mechanism: DNA fingerprinting uses VNTRs as probes to create unique patterns of bands on a gel.
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About This Question
- Subject
- biology
- Chapter
- biotechnology and its applications
- Topic
- dna fingerprinting
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Show length polymorphism
- Nature of VNTR: These are short sequences of DNA (satellite DNA) that repeat multiple times in tandem at specific locations on chromosomes.
- Polymorphism: The number of repeats varies significantly from person to person (except between monozygotic twins).
- Application: Because the number of repeats (and thus the length of the fragment) is different, comparing these length polymorphisms allows scientists to uniquely identify individuals.
- Mechanism: DNA fingerprinting uses VNTRs as probes to create unique patterns of bands on a gel.
This medium difficulty biology question is from the chapter biotechnology and its applications, covering the topic of dna fingerprinting. It appeared in the 2025 exam.
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