EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 19, Problem 4TYU
The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?
- A. Forelimb evolution was adaptive in people and bats, but not in whales.
- B. Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.
- C. Genes mutate faster in whales than in humans or bats.
- D. Whales are not properly classified as mammals.
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Changes in the traits of the fossils studied are consistent with what is expected to be favored by natural selection, given environmental changes during that time. Thus, from the late Miocene, modern horses evolved to have the following traits, consistent with grassland ecosystems becoming more common, EXCEPT for --
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Fossilized remains of prehistoric mastodons show anatomical similarities to modern-day elephants. These similarities provided the first evidence that mastodons were related to modern-day elephants. Which of the following is the BEST additional evidence that mastodons were related to elephants?
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Mastodon tissues contained proteins with similar amino acid sequences compared to modern-day elephants.
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Mastodon fossils were found in the same area where modern-day elephants live.
D.
Mastodons ate a diet similar to that of modern-day elephants.
The figure shows a phylogenetic tree of various members of the order Proboscidea, which includes modern elephants. Which of the following claims is best supported by the information in the figure ?
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Chapter 19 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 19.1 - How did Huttons and Lyells ideas influence Darwins...Ch. 19.1 - MAKE CONNECTIONS Scientific hypotheses must be...Ch. 19.2 - How does the concept of descent with modification...Ch. 19.2 - Prob. 2CCCh. 19.2 - MAKE CONNECTIONS Review the relationship between...Ch. 19.3 - Explain how the following statement is inaccurate:...Ch. 19.3 - How does evolution account for (a) the similar...Ch. 19.3 - WHAT IF? Fossils show that dinosaurs originated...Ch. 19 - Which of the following is not an observation or...Ch. 19 - Which of the following observations helped Darwin...
Ch. 19 - Prob. 3TYUCh. 19 - The upper forelimbs of humans and bats have fairly...Ch. 19 - DNA sequences In many human genes are very similar...Ch. 19 - SCIENTIFIC INQUIRY DRAW IT Mosquitoes resistant to...Ch. 19 - FOCUS ON EVOLUTION Explain why anatomical and...Ch. 19 - FOCUS ON INTERACTIONS Write a short essay (about...Ch. 19 - SYNTHESIZE YOUR KNOWLEDGE This honeypot ant (genus...
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