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Chapter 23 Quiz ANS - Chapter 23 Quiz 1 In the context of...

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Chapter 23 Quiz 1. In the context of populations, how do we define evolution? a. Evolution is a change in a population's allele frequencies over generations. b. Evolution is always caused by natural selection. c. Evolution is the explanation for how organic molecules formed from inorganic molecules. d. Evolution is the tendency for some individuals in a population to leave more offspring than others. e. Evolution is the way in which sexual reproduction can rapidly spread advantageous traits throughout a population. 2. Which of the following mechanisms can alter allele frequencies? 3. Which example below correctly describes average heterozygosity? 4. The human genome consists of approximately 3 billion base pairs. If humans typically differ from one another by about 3 million base pairs, what is the nucleotide variability of Homo sapiens ? 5. Which example below would most likely exhibit a cline? a. Male bowerbirds decorate stations to attract females. b. Rabbits that live in colder regions tend to have smaller ears than rabbits of the same species that live in warmer regions. c. Individuals who are heterozygotic for the sickle-cell disease allele have a greater resistance to malaria. d. Seals have flippers that make them great swimmers but make their movements on rocks and land very cumbersome. e. Cows are selectively bred to gain a higher milk yield. 6. Which of the following can form entirely new alleles? 7. Sexual recombination includes the shuffling of chromosomes in _____ and fertilization. a. Genetic drift b. Mitosis
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c. Mutation d. Meiosis e. Natural selection
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