Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Textbook Question
Chapter 1.2, Problem 2CC
Referring to Figure 1.20, provide a possible explanation for how, over a very long time, the green warbler finch came to have a slender beak.
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You are a researcher studying birds in an Indonesian rainforest. You have just discovered two new species whose beaks are markedly different, which you have named Laetiphonia orthorhynchus and Laetiphonia rhamphis. In particular, the beaks of L. orthorhynchus are very long, straight and pointed, whereas L. rhamphis have beaks that are quite short, wide and curved downwards. In further studies, you find that the same gene codes for beak shape in both species.
In your own words, explain at least two ways that changes in gene expression could result in the differences you observe between these two species. Make sure to be specific in how your explanation applies to the bird species in this example.
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Chapter 1 Solutions
Campbell Biology: Custom Edition
Ch. 1.1 - Starting with the molecular level in Figure 1.3,...Ch. 1.1 - Identify the theme or themes exemplified by (a)...Ch. 1.1 - WHAT IF? For each theme discussed in this...Ch. 1.2 - Explain why "editing" is a metaphor for how...Ch. 1.2 - Referring to Figure 1.20, provide a possible...Ch. 1.2 - DRAW IT The three domains you learned about in...Ch. 1.3 - What qualitative Observation led to the...Ch. 1.3 - Contrast inductive reasoning with deductive...Ch. 1.3 - Why is natural selection called a theory?Ch. 1.3 - WHAT IF? In the deserts of New Mexico, the soils...
Ch. 1.4 - How does science differ from technology?Ch. 1.4 - MAKE CONNECTIONS The gene that causes sickle-cell...Ch. 1 - Prob. 1.1CRCh. 1 - How could natural selection have led to the...Ch. 1 - What are the roles of gathering and interpreting...Ch. 1 - Explain why different approaches and diverse...Ch. 1 - Prob. 1TYUCh. 1 - Prob. 2TYUCh. 1 - Which of the following best demonstrates the unity...Ch. 1 - Prob. 4TYUCh. 1 - Which of the following statements best...Ch. 1 - Which of the following is an example of...Ch. 1 - Which sentence best describes the logic of...Ch. 1 - DRAW IT With rough sketches, draw a biological...Ch. 1 - EVOLUTION CONNECTION A typical prokaryotic cell...Ch. 1 - SCIENTIFIC INQUIRY Based an the results of the...Ch. 1 - SCIENTIFIC INQUIRY Scientists search the...Ch. 1 - WRITE ABOUT A THEME: EVOLUTION In a Short essay...Ch. 1 - SYNTHESIZE YOUR KNOWLEDGE Can you pick out the...
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- What contributed to the natural selection of the finches' beaks?arrow_forwardThese finches all evolved from a common ancestor. They adapted characteristics which made them each a different species. 1. What is the term for a new species evolving. 2. Analyze the different beak shapes and sizes in this image, then explain why you think the birds beaks are shaped the way that they are shaped. 1. Geospiza magnirostris. 3. Geuspiza parvula. 2. Geospiza fortis. 4. Certhiidea olivasea.arrow_forwardIs this evolutionary conservation of the pecten structure evidence that natural selection might be maintaining the pecten in its present form in many bird species? Is this theory one that suggests the pecten has a significant adaptive function in birds? Do you believe that experiments might be useful in determining the adaptive function of the pecten if it indeed serves an adaptive function? Outline a simple experiment to see whether the presence of a pecten in the bird's eye is an adaptation.arrow_forward
- The phylogeny in this figure shows the evolution of visual opsins in tetrapods. Each colored triangle represents a different opsin. Which of the following accurately describes the opsins in these species? Squamate reptiles Birds Rodents New World Baboons primates Click to view larger image. - Opain loss x Opain loss ▲▲▲▲ Tetrapod ancestor ▲▲▲ Humane +A Opin gain a. The green opsin is a synapomorphy in rodents and New World primates, and the light blue opsin is a symplesiomorphy in baboons and humans. b. The light blue opsin is a synapomorphy in squamate reptiles and birds, and the green opsin is an ancestral trait. OC. The purple opsin is an analogous trait, and the green opsin is a homologous trait. Od. The green opsin is a synapomorphy in baboons and humans, and the light blue opsin is symplesiomorphy in squamate reptiles and birds.arrow_forwardDescribe the impact of ecological niches on the evolution of Galápagos finch beaksarrow_forwardIf an altered structure, such as the long neck of the giraffe, is advantageous, why don’t all species have that structure?arrow_forward
- What type of geographic barriers could have led to the speciation of finch in the Galápagos Islands?arrow_forwardFlight in birds developed over time due to multiple evolutionary steps. The development of feathers, hollow bones, large flight muscles, and efficient gas exchange was vital for flight. Describe the order in which these adaptations likely evolved and explain your reasoning.arrow_forwardFlight in birds developed over time as a result of multiple evolutionary steps. The development of feathers, hollow bones, large flight muscles, and efficient gas exchange were all vital for flight. Describe the order in which these adaptations likely evolved and explain your reasoning.arrow_forward
- Based on the phylogenetic tree diagram in Figure 34.2, predict which vertebrate groups should have lungs or lung derivatives. Explain.arrow_forwarddescribe arguments for and against classifying feathers as an adaptation to flying in birds.arrow_forwardWhat is the function of including an outgroup in this phylogeny? After all, the point of the phylogeny is to see which Galapagos finch species are most closely related to each other.arrow_forward
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