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EVOLUTION CONNECTION INTERPRET THE DATA Draw a phylogenetic tree of Bilateria that
Chapter 33, Problem 7(choose chapter or problem)
EVOLUTION CONNECTION INTERPRET THE DATA Draw a phylogenetic tree of Bilateria that includes the ten phyla of bilaterians discussed in detail in this chapter. Label each branch that leads to a phylum with a C, P, or A, depending on whether members of the phylum are coelomates (C), pseudocoelomates (P), or acoelomates (A). Use your labeled tree to answer the following questions: (a) For each of the three major clades of bilaterians, what (if anything) can be inferred about whether the common ancestor of the clade had a true coelom? (b)To what extent has the presence of a true coelom in animals changed over the course of evolution?
Questions & Answers
QUESTION:
EVOLUTION CONNECTION INTERPRET THE DATA Draw a phylogenetic tree of Bilateria that includes the ten phyla of bilaterians discussed in detail in this chapter. Label each branch that leads to a phylum with a C, P, or A, depending on whether members of the phylum are coelomates (C), pseudocoelomates (P), or acoelomates (A). Use your labeled tree to answer the following questions: (a) For each of the three major clades of bilaterians, what (if anything) can be inferred about whether the common ancestor of the clade had a true coelom? (b)To what extent has the presence of a true coelom in animals changed over the course of evolution?
ANSWER:(a)Through the phylogenetic tree, it appears that the common ancestor of the protostome clade (represented by the phyla Lophotrochozoa and Ecdysozoa) had a true coelom (C). The common ancestor of Deuterostomia (represented