Campbell Biology (10th Edition)
Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 32, Problem 6TYU

SCIENTIFIC INQUIRY • INTERPRET THE DATA Redraw the bilaterian portion of Figure 32.11 for the nine phyla in the table below. Consider these blastopore fates: protostomy (mouth develops from the blastopore), deuterostomy (anus develops from the blastopore), or neither (the blastopore closes and the mouth develops elsewhere). Depending on the blastopore fate of its members, label each branch that leads to a phylum with P, D, N, or a combination of these letters. What Is the ancestral blastopore fate? How many times has blastopore fate changed over the course of evolution? Explain.

Blastopore Fate Phyla
Protostomy (P) Platyhelminthes, Syndermata, Nematoda; most Mollusca, most Annelida; few Arthropoda
Deuterostomy (D) Echinodermata, Chordata; most Arthropoda; few Mollusca, few Annelida
Neither (N) Acoela
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See attached. 1. Which pair of animals in numbers 1-3 belongs to a common ancestral group? Explain your answer.2. Fossils and anatomical records both provide pieces of evidence of evolution. How do you determine the age of fossils of an Aurorazhdarcho micronyx and an Archeopterix?
Phyla Cnidaria and Ctenophora are: A. Diploblastic (two germ layers), with no symmetry B. Triploblastic (three germ layers) and bilaterally symmetrical C. Triploblastic (three germ layers), with no symmetry D. Diploblastic (two germ layers) and radially symmetrical O E. Two germ layers with bilateral symmetry
Describe how metamorphosis changes the structures involved in gas exchange over the life cycle of animals in the clade Anura, and what evolutionary advantage this change provides.
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