Biology 0610 · IGCSE · Concept and uses of classification systems

Concept and uses of classification systems — practice question

The evolutionary relationships among four bacterial species, P, Q, R and S, were compared. • Species P and Q share a more recent common ancestor than either one does with species R. • Species S evolved recently from species P. Which species has DNA base sequences that are least similar to those of the other three bacterial species?

  • AP
  • BQ
  • CR
  • DS

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