[Campbell Biology P.509] Based on the text, what is the combined approximate percentage diff... | Practice Question

Based on the text, what is the combined approximate percentage difference between the human and chimpanzee genomes, considering both single nucleotide substitutions and insertions/deletions?

  • A: Approximately 1.2%
  • B: Approximately 2.7%
  • C: Approximately 3.9%
  • D: Approximately 7,000%

Explanation

The text states that 'Considering single nucleotide substitutions, the two genomes differ by only 1.2%.' It further adds that 'When researchers looked at longer stretches of DNA, however, they were surprised to find a further 2.7% difference due to insertions or deletions'. Therefore, the combined approximate percentage difference is 1.2% + 2.7% = 3.9%.