NEETZoologyMolecular Basis of Inheritance
What are repetitive DNA sequences?
Options
- ADNA sequences that code for proteins
- BDNA sequences that form the basis of paternity testing
- CSmall stretches of DNA that are repeated many times
- DSatellite DNA sequences that form a major peak during density gradient centrifugation
Correct answer
C. Small stretches of DNA that are repeated many times
Step-by-step solution
DNA fingerprinting involves identifying differences in some specific regions in a DNA sequence called repetitive DNA, because in these sequences, a small stretch of DNA is repeated many times . These repetitive DNA are separated from bulk genomic DNA as different peaks during density gradient centrifugation. The bulk DNA forms a major peak and the other small peaks are referred to as satellite DNA. Depending on base composition (A : T rich or G:C rich), length of segment, and number of repetitive units, the satelli