Challenge Questions
41. Consider a polymorphic gene with three alleles: A, B, and C. A. If the frequencies of the alleles A and B are 0.2 and 0.3, the frequency of allele C is closest to ___. Consider a gene with only…
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29. A scientist is studying the genetics of a population of plants that she suspects is undergoing natural selection. After examining samples of the population’s DNA over several years, she finds the following data: Year Allele A Frequency Allele B…
Critical Thinking Questions
17. Describe natural selection and give an example of natural selection at work in a population. 18. Imagine you are trying to test whether a population of flowers is undergoing evolution. You suspect there is selection pressure on the color…
Review Questions
1. What is the ultimate source of all variation in and among populations? 2. When male lion cubs reach sexual maturity, they are thrown out of their group, or pride, by the dominant male and must live on their own…
Key Terms
adaptive evolutionincrease in frequency of beneficial alleles and decrease in deleterious alleles due to selectionallele frequency(also, gene frequency) rate at which a specific allele appears within a populationassortative matingwhen individuals tend to mate with those who are phenotypically similar to…
Challenge Questions
72. In addition to biology, evidence drawn from many different disciplines, including chemistry, geology, and mathematics, supports models of the origin of life on Earth. In order to determine when the first forms of life likely formed, the rate of…
Test Prep for AP® Courses
42. Prior to 1800 in England, the typical moth of the species Biston betularia (peppered moth) had a light pattern. Dark colored moths were rare. By the late 19th century, the light-colored moths were rare, and the moths with dark patterns were…
Critical Thinking Questions
25. What conclusions can you draw about the relationship between the way in which the present-day theory of evolution developed and the credibility of the theory? Explain your thinking. 26. Describe how an adaptation, such as better running speed, relates…
Review Questions
1. Which scientific concept did Charles Darwin and Alfred Wallace independently discover? 2. Which of these statements about a natural principle that points to the inevitability of natural selection is false? 3. Which is the best definition of adaptation? 4.…
Key Terms
acquired characteristicsmodifications caused by an individual’s environment that can be inherited by its offspringadaptationheritable trait or behavior in an organism that aids in its survival and reproduction in its present environmentadaptive radiationspeciation when one species radiates out to form several…