[Campbell Biology P.42] In constructing phylogenetic trees, it is crucial to distinguish be... | Practice Question

In constructing phylogenetic trees, it is crucial to distinguish between homology and analogy. Which of the following statements correctly differentiates between these two concepts?

  • A: Homology refers to similarity due to shared ancestry, while analogy refers to similarity due to convergent evolution.
  • B: Homology describes traits that have similar functions but different structures, whereas analogy describes traits with similar structures but different functions.
  • C: Analogy is used in morphological data analysis, whereas homology is exclusively used in molecular data analysis.
  • D: Homology suggests a less reliable evolutionary relationship than analogy.

Explanation

Homology is similarity between species that results from shared ancestry, indicating a true evolutionary relationship. Analogy, or homoplasy, is similarity between organisms that is due to convergent evolution, not shared ancestry, and can be misleading in phylogenetic analysis. Correctly distinguishing between them is vital for accurate tree construction.