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 21.2, Problem 3CC
WHAT IF? A locus that affects susceptibility to a degenerative brain disease has two alleles, V and v. In a population, 16 people have genotype VV, 92 have genotype Vv, and 12 have genotype vv. Is this population evolving? Explain.
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Chapter 21 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 21.1 - Explain why genetic variation within a population...Ch. 21.1 - Of all the mutations that occur in a population,...Ch. 21.1 - Prob. 3CCCh. 21.2 - A population has 700 individuals, 85 of genotype...Ch. 21.2 - The frequency of allele a is 0.45 for a population...Ch. 21.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 21.3 - In what sense is natural selection more...Ch. 21.3 - Distinguish genetic drift from gene flow in terms...Ch. 21.3 - WHAT IF? Suppose two plant populations exchange...Ch. 21.4 - What is the relative fitness of a sterile mule?...
Ch. 21.4 - Explain why natural selection is the only...Ch. 21.4 - Prob. 3CCCh. 21 - Natural selection changes allele frequencies...Ch. 21 - No two people are genetically identical, except...Ch. 21 - Sparrows With average-sized w1ngs survive severe...Ch. 21 - If the nucleotide variability of a locus equals...Ch. 21 - There are 25 individuals in population 1, all with...Ch. 21 - A fruit fly population has a gene with two...Ch. 21 - FOCUS ON EVOLUTION Using at least TWO examples,...Ch. 21 - Prob. 9TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE This kettle lake formed...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Q1: How much did organic food sales grow during the period covered in the graph? How much did the incidence of autism grow? Q2: Why might both organic food sales and autism prevalence have increased during this time period? A Reddit user in the original discussion thread suggested that both might be affected by increasing wealth in the United States. How might increased wealth affect these variables? Q3: In what way has the vaccine-autism debate been confused by people misinterpreting correlation as causation?arrow_forwardMAKE CONNECTIONS Balancing selection can maintain variation at a locus (see Concept 23.4). Based on theforaging experiments described in this chapter, devise asimple hypothesis to explain the presence of both for Rand forsalleles in natural fly populationsarrow_forwardWHAT IF? In the deserts of New Mexico, the soils aremostly sandy, with occasional regions of black rockderived from lava flows that occurred about 1,000 yearsago. Mice are found in both sandy and rocky areas, andowls are known predators. What might you expect aboutcoat color in these two mouse populations? Explain. Howwould you use this ecosystem to further test the camouflage hypothesis?arrow_forward
- WHAT IF? The increased fertility of the experimental hybrids could haveresulted from natural selection for thriving under laboratory conditions.Evaluate this alternative explanation for the result.arrow_forwardINTERPRET DATA Compare the two graphs in Figure 1-17. What information does the second graph illustrate? What possible explanation can you give for the differences shown in the two graphs? (a) Number of chimpanzees who successfully employed specific method of tool use. (b) Number of chimpanzees who successfully employed learned method of tool use two months later. Figure 1-17 An experiment testing learning in chimpanzee populations In the photo, wild chimpanzees are shown observing a member of their group using a tool.arrow_forward3. Is it possible for a recessive trait to be frequently expressed in a population? Why?4. If a certain type of trait in a family or clan is considered by most people to be “better” or “ideal”, is itpossible to maintain the same type of trait in the succeeding generations? If so, how?arrow_forward
- Q5.9. A person who is heterozygous for the cystic fibrosis allele moves to a small, isolated community where no one previously carried the allele. If the cystic fibrosis allele protects against tuberculosis the same way the sickle cell allele protects against malaria, what should happen to the frequency of the cystic fibrosis allele in the community over time, and why?arrow_forwardVISUAL 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.arrow_forwardScenario 2In the year 2015, another group of scientists studied the squirrel coat color and found that the population of squirrels had increased. They found 850 squirrels in the same area, of which 115 had a red coat. Assume that the population is in Hardy Weinberg’s equilibrium. 5B. What is the frequency of the recessive allele?(Put your answer here rounded to the nearest hundredth)arrow_forward
- WHAT IF? Imagine two populations of a fish species,one in the Mediterranean Sea and one in the CaribbeanSea. Now imagine two scenarios: (1) The populationsbreed separately, and (2) adults of both populationsmigrate yearly to the North Atlantic to interbreed. Whichscenario would result in a greater loss of genetic diversityif the Mediterranean population were harvestedto extinction? Explain your answer.arrow_forwardThe population is an important unit in ecology as well as other biological sciences. How is a population defined, and what are the strengths and weaknesses of this definition? Are there some species that at certain times or places are not in populations?arrow_forwardWHAT IF? In 2005, Icelandic scientists reported findinga large chromosomal inversion present in 20% of northern Europeans, and they noted that Icelandic womenwith this inversion had significantly more children thanwomen without it. What would you expect to happento the frequency of this inversion in the Icelandicpopulation in future generations?arrow_forward
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