- A All DNA sequences present in the genome are sometimes thought to provide a direct, measurable fitness benefit to the organism
- B Repetitive and transposable DNA elements persist because they replicate themselves, not because they benefit the host
- C Mainly protein-coding regions of the genome are sometimes thought to carry out any meaningful biochemical or regulatory function
- D Non-coding junk DNA sequences are sometimes thought to be steadily eliminated from the genome over a long span of evolutionary time
Correct answer: B. Repetitive and transposable DNA elements persist because they replicate themselves, not because they benefit the host
Explanation: Selfish DNA: transposons and other repetitive elements persist because they efficiently replicate and spread within genomes, even if they confer no benefit (or are slightly harmful) to the host.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →