Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Chapter 27.4, Problem 3CC
MAKE CONNECTIONS The radiation of bilaterians in marine environments from 535 to 400 million years ago demonstrates that evolution is not goal oriented— it is not, for example, directed toward the origin of terrestrial vertebrates. Explain. (Review Concept 23.4.)
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You have now studied three different types of anatomical structures.
Homologous structures show individual variations on a common anatomical theme. These
are seen in organisms that are closely related.
1. Give an example of a homologous structure from this activity:
Analogous structures have very different anatomies but similar functions. These are seen in
organismsthat are not necessarily closely related but live in similar environments and have
similar adaptations.
2. Give an example of an analogous structure from this activity:
Vestigial structures are anatomical remnants that were important in the organism's ancestors
but are nolonger used in the same way.
3. Give an example of a vestigial structure from this activity:
PART II. COMPARATIVE ANATOMY AND EMBRYOLOGY EVIDENCE
> Using the information in the Reading file part Il and textbook reading, answer the following
questions:
1. Whales possess vestigial organs in the form of pelvic girdle and hind limb bones. How would
you explain this?
Page 3 of 6
Evolution Lab Exercise Report (by Dr. Lapik)
2. How can you explain that, while forelimbs of bats and human arms are used for vastly different
purposes, they do have similar anatomy?
3. How would you explain the presence of gill slits in embryos of animals that do not form gills?
Define convergent evolution, and discuss how the cephalopod eye and the vertebrate eye demonstrate this phenomenon.
Chapter 27 Solutions
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Ch. 27.1 - Prob. 1CCCh. 27.1 - Prob. 2CCCh. 27.1 - Prob. 3CCCh. 27.2 - What is the Cambrian explosion? Why is it...Ch. 27.2 - Prob. 2CCCh. 27.3 - Prob. 1CCCh. 27.3 - WHAT IF? Would it be accurate to describe the...Ch. 27.4 - Prob. 1CCCh. 27.4 - Describe two key adaptations of aquatic...Ch. 27.4 - MAKE CONNECTIONS The radiation of bilaterians in...
Ch. 27.5 - Describe two adaptations that have enabled insects...Ch. 27.5 - MAKE CONNECTIONS Compare and contrast how the...Ch. 27.6 - Describe three key amniote adaptations for life on...Ch. 27.6 - Prob. 2CCCh. 27.6 - WHAT IF? Which came first, the chicken or the egg?...Ch. 27.7 - Describe how ocean communities changed in the...Ch. 27.7 - Prob. 2CCCh. 27.7 - Prob. 3CCCh. 27 - Prob. 1TYUCh. 27 - Fossil steroid and molecular clock evidence...Ch. 27 - Which of the following was probably the least...Ch. 27 - Prob. 4TYUCh. 27 - Prob. 5TYUCh. 27 - Prob. 6TYUCh. 27 - Prob. 7TYUCh. 27 - FOCUS ON EVOLUTION In Figure 27.29, circle the...Ch. 27 - FOCUS ON ORGANIZATION Early tetrapods had a...Ch. 27 - SYNTHESIZE YOUR KNOWLEDGE Collectively, do these...
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- Hello, I need help with number 3 a, b, & c using the diagram below. Pls & thank you! 3. a) What features does the organism shown above have that indicate that it is our direct ancestor among the Cambrian fauna? 3. b) When the organism shown above was swimming in the Cambrian seas, it was very small compared to the apex predator (Anomalocaris), which was several feet long. What adaptations might the organism shown above have to evade predation by Anomalocaris? 3. c) A famous evolutionary biologist says that “everything in evolution is contingent”, which he explains means that events could always have turned out differently. Do you think that the survival of our direct ancestor is an example of a lucky accident that allowed the later evolution of vertebrates, including us? Why or why not? Photos reference: Futuyma, D. J., & Kirkpatrick, M. (2017). Chapter 17 The History of Life. In Evolution (4th ed., pp. 430-467). Sunderland, Massachusetts: Sinauer Associates.arrow_forwardPlease do fast How old are the first recognizable mammals relative to the K/T boundary layer (i.e., extinction of the dinosaurs), and from what reptilian lineage did they evolve? Is this lineage the same reptilian lineage that gave rise to birds? How are these lineages distinguished? Hold old are the first fossil birds? What other plant/animal lineages first became widespread in the Tertiary that were less common in the Cretaceous?..arrow_forwardTest Your Understanding Apply and Analyze 9. In interpreting a cladogram, (a) we can identify the specific ancestor of each taxon by tracing each branch back to the node closest to the root (b) taxa on the right side of a cladogram have evolved from the taxa on the left side (c) the relative placement of smaller branches allows us to determine the number of years since a particular taxon has evolved (d) we can determine relationships by tracing along the branches back to the most recent common ancestor (e) we must first identify horizontal gene transferarrow_forward
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