Phylogeny

AP Biology· difficulty 2/5

trait F A B C D E

Trait F arises at the marked node and is shared by C, D, E. Trait F is best described as

  • A

    A symplesiomorphy of all five taxa

  • B

    An autapomorphy of taxon E

  • C

    A homoplasy due to convergence

  • D

    A synapomorphy uniting clade (C, D, E)

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Explanation

A synapomorphy is a derived character shared by two or more taxa due to inheritance from their MRCA. Trait F appearing at the node ancestral to C, D, and E and shared among them defines a synapomorphy.

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