Question

In the eukaryotic genome
(A) Repetitive DNA is represented as a different peak in density gradient centrifugation
(B) The classification of microsatellite and minisatellite is based on the base composition, length of the segment, and number of repetitive units
(C) Coding DNA forms a large portion of the human genome
(D) Repetitive DNA shows high degree of polymorphism

Choose the correct option

• A. A, C, D
  
• B. A, B, D
  
• C. B, C, D
  
• D. All of the above

Answer 1

The correct option is B A, B, D


The eukaryotic DNA is classified on the basis of reiteration as highly repetitive DNA, moderately repetitive DNA, and single/low copy DNA.

Non-repetitive DNA sequences are those sequences that are present in only one copy number in the haploid genome. Coding sequences are examples of non-repetitive DNA. Coding DNA forms only a small component of the human genome.
Repetitive DNA are those sequences that are present in more than one copy number in the haploid genome. They show a high degree of polymorphism.

Repetitive DNA is represented as a different peak in density centrifugation. It has a distinct average of DNA base composition (GC) content, which allows it to form a separate fraction by virtue of its distinct buoyant density. This peak is represented as satellite DNA which is further classified as microsatellite and minisatellite on the basis of its base composition, length of the segment, and number of repetitive units.