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Understanding Phylogenetic Trees: Nodes and Evolutionary Relationships

Explore the concept of nodes on phylogenetic trees, depicting speciation events where ancestral species split into descendant lineages. Understand the evolutionary relationships among taxa displayed on the tree.

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Understanding Phylogenetic Trees: Nodes and Evolutionary Relationships

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  1. Question 1 = B

  2. Question 2 = B

  3. Question 3 = D

  4. Question 4 = D

  5. Question 5 = D

  6. Question 6 = C • On a phylogenetic tree, what happened at a ‘node’? • A) an ancestral species gained a new adaptation • B) an ancestral species failed to evolve • C) speciation (i.e., an ancestral species split into two descendant lineages)

  7. Question 7 = D • According to the tree at the left • A) seals are ancestral to horses • B) whales are the most evolved of the taxa shown • C) horses evolved into giraffes • D) none of the above

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