Question

which dna fingerprinting technique examines the length variation of dna repeat sequences in human dna?
variable tandem repeats analysis
polymerase chain reaction analysis
y chromosome analysis
mitochondrial dna analysis

Explanation:

To solve this, we analyze each option:

• Variable tandem repeats analysis: Tandem repeats are DNA sequences repeated in tandem, and their length variation is examined in DNA fingerprinting. This matches the question's description.
• Polymerase chain reaction (PCR) analysis: PCR is a technique to amplify DNA, not specifically for analyzing length variation of repeat sequences for fingerprinting in this context.
• Y chromosome analysis: Focuses on Y - chromosome - specific DNA, not on length variation of general DNA repeat sequences for fingerprinting.
• Mitochondrial DNA analysis: Analyzes mitochondrial DNA, not the length variation of nuclear DNA repeat sequences for fingerprinting.

Answer:

A. variable tandem repeats analysis