A3.2 Classification and cladistics Quiz
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5 questions, one answer each
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1. A clade consists of:
- A. All organisms in the same habitat
- B. A common ancestor and all its descendants
- C. Organisms that look similar
- D. All organisms of one rank
2. On a cladogram, a node represents:
- A. A living species
- B. A hypothetical common ancestor
- C. An extinct species with fossils
- D. A mutation
3. Parsimony selects the cladogram that:
- A. Has the most branches
- B. Requires the fewest sequence changes
- C. Matches morphology best
- D. Has the oldest root
4. Which factor makes the molecular clock only an estimate?
- A. Mutation rate varies with generation time
- B. DNA does not mutate
- C. All genes change at the same rate
- D. Fossils are always accurate
5. The three-domain classification was based on:
- A. Cell wall composition
- B. Ribosomal RNA base sequences
- C. Presence of a nucleus
- D. Mode of nutrition