APB.399 Construct a Tree from Character Data
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An AP Biology student compares fictional clam taxa using molecular protein character data. A 1 means the taxon has the listed derived state, and 0 means it retains the ancestral state inferred from the outgroup. Some characters may represent homoplasy, so compare the total pattern rather than a single trait. Character data: Taxon | protein site 160 = Val | protein site 165 = Leu | protein site 170 = Ser | protein site 175 = Gly | protein site 180 = Asp | protein site 185 = Lys Bela70 clam | 0 | 0 | 0 | 0 | 0 | 0 Cato70 clam | 1 | 0 | 1 | 0 | 1 | 0 Doma70 clam | 1 | 0 | 1 | 0 | 0 | 1 Eris70 clam | 1 | 1 | 0 | 0 | 0 | 0 Fira70 clam | 1 | 1 | 0 | 1 | 0 | 1 Galen70 clam | 1 | 1 | 0 | 1 | 0 | 1 In the answer choices, taxa inside the same parentheses form a clade. Which cladogram is most consistent with these data using the fewest character-state changes?

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