Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 39.5, Problem 2CC
MAKE CONNECTIONS Balancing selection can maintain variation at a locus (see Concept 21.4). Based on the foraging experiments described in this chapter, devise a simple hypothesis to explain the presence of both forR and forS alleles in natural fly populations.
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VISUAL SKILLS Consider a population in which heterozygotes at a certain locus have an extreme phenotype(such as being larger than homozygotes) that confersa selective advantage. Compare this description to themodels of selection modes shown in Figure 23.13. Doesthis situation represent directional, disruptive, or stabilizing selection? Explain your answer.
MAKE CONNECTIONS Explain how natural selection could increase the resemblance of a harmlessspecies to a distantly related harmful species. In addition to selection, what else could account for a harmlessspecies resembling a closely related harmful species? (See Concept 22.2.)
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In zebra finch females prefer males who have a larger yellow cheek patch. Researchers investigating this preference think that females must benefit from choosing males with large cheek patches. Provide three hypotheses regarding the direct, or indirect benefits, she might receive.
Chapter 39 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 39.1 - Contrast the role of Ca2+ in the contraction of a...Ch. 39.1 - WHAT IF? Why are the muscles of an animal that has...Ch. 39.1 - Prob. 3CCCh. 39.2 - Prob. 1CCCh. 39.2 - Prob. 2CCCh. 39.2 - Prob. 3CCCh. 39.3 - Prob. 1CCCh. 39.3 - MAKE CONNECTIONS How is the lunar-linked rhythm of...Ch. 39.4 - How might associative learning explain why...Ch. 39.4 - Prob. 2CC
Ch. 39.4 - MAKE CONNECTIONS How might a learned behavior...Ch. 39.5 - Prob. 1CCCh. 39.5 - MAKE CONNECTIONS Balancing selection can maintain...Ch. 39.6 - Prob. 1CCCh. 39.6 - Prob. 2CCCh. 39 - During the contraction of a vertebrate skeletal...Ch. 39 - Prob. 2TYUCh. 39 - According to Hamiltons rule, A. natural selection...Ch. 39 - The binding of calcium to the troponin complex A....Ch. 39 - Curare, a substance that blocks the acetylcholine...Ch. 39 - Prob. 6TYUCh. 39 - Prob. 7TYUCh. 39 - SCIENTIFIC INQUIRY Propose a hypothesis to explain...Ch. 39 - SCIENTIFIC INQUIRY Scientists studying scrub jays...Ch. 39 - Prob. 10TYUCh. 39 - FOCUS ON INFORMATION Learning is defined as a...Ch. 39 - SYNTHESIZE YOUR KNOWLEDGE Acorn woodpeckers...
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- EVOLUTION CONNECTION Explain the biological basis forassigning all human populations to a single species. Can youthink of a scenario by which a second human species couldoriginate in the future?arrow_forwardBook: Greatest Show on Earth Answer both question below. Explain what Dawkins says selection is acting on in chapter 2 and how that variation is distributed throughout a population (gene pool) (blending vs. independent assortment). -150 word minimum In chapter 3, Dawkins suggests that selection is powerful yet unconscious of its actions ("without any understanding at all"). He uses a variety of examples to highlight how various organisms drive selection, sometimes consciously and sometimes unconsciously, by mediating the breeding process. Using one of the examples explain how some organisms unconsciously drive the selection of others. -150 word minimumarrow_forwardKingma et al. (2011) found that in the purple-crowned fairy-wren, most subordinate helpers at the nest feed full siblings or half siblings, but some helpers are unrelated to the nestlings they assist. What Darwinian puzzle is created by these findings, and how might you solve the puzzle by using inclusive fitness theory? What predictions follow from the explanation(s) that you propose?arrow_forward
- Fitness and Selection: Rodent tails A researcher is studying a rodent species with a lot of variability in tail length. Individuals may have short tails, medium tails, or long tails. The researcher has noticed that a new invasive predator, which catches prey by their tails as they try to escape, seems to catch individuals with long tails more often than those with short tails. Based on a small field trial, the relative fitness of long-tailed individuals seems to be 0.6 compared to short-tailed ones (1.0), with medium tails in-between (0.8). Use the Examples tab to predict the outcome after selection for the rodent in regions with the invasive predator. What describes the population after 100 generations of selection? Choose all that apply. A-Short Tailed individuals are the most common phenotype. B-Short Tailed individuals are the only phenotype. C-This is an example of disruptive selection. D- The long tailed phenotype is no longer present E-This is an example of directional…arrow_forwardSelection may also act against heterozygotes. How do allele frequencies change if the two homozygotes have unequal fitness, but heterozgotes have a constant 50% reduced fitness? Simulate allele frequency changes with multiple values of p0 (between 0 and 1). can you explain what happens and whyarrow_forwardBased on (MS-LS4-4) standard(grade8) - Mathematical Representations of Natural Selection: Based on the 'Galapagos Islands Finches - Rainfall Effect' data set(picture attached).This data set shows data about finch populations that was collected at the end of a five year period where there were different amounts of rainfall. How were the finches affected by drought (rainfall less than 25cm/yr) and excess rainfall (rainfall more than 25 cm/yr)? Describe at least two changes observed. What do you think caused the changes in the finch population and average beak size during the periods of excess rainfall and periods of drought? Include appropriate scientific vocabulary when possible. What changes in 'beak-depth' genes within the finch population can be correlated to environmental changes?arrow_forward
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