CAMPBELL BIO TXT+MOD.MAST.BIO W ETEXT
CAMPBELL BIO TXT+MOD.MAST.BIO W ETEXT
10th Edition
ISBN: 9781323257937
Author: Reece
Publisher: PEARSON C
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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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