Chapter 23 Quiz ANS

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? a. Natural selection b. Gene flow c. Genetic drift d. All of the listed responses are correct e. None of the listed responses are correct 3. Which example below correctly describes average heterozygosity? a. Average heterozygosity refers to the number of individuals in a population that are heterozygous for a certain trait. b. Average heterozygosity is usually less than the average difference between nucleotide sequences. c. Average heterozygosity is measured by looking at changes in karyotypes. d. Average heterozygosity is measured by comparing the nucleotide sequences of DNA samples, and then averaging the data from the comparison. e. Average heterozygosity refers to the average percentage of loci that are heterozygous in a population. 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 ? a. 10% b. 1% c. 3% d. 50% e. .1% 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? a. Natural selection b. The environment c. Sexual recombination d. Mutation e. Genetic drift 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 8. Which type of mutation plays the most important role in increasing the number of genes in the gene pool? a. Point mutation b. Rearrangement of gene loci c. Mutations are so rare that there are no mutations that can have such an important effect. d. Duplication e. Changes in nucleotide sequence 9. In a large population of randomly breeding organisms, the frequency of a recessive allele is initially 0.3. There is no migration and no selection. Humans enter this ecosystem and selectively hunt individuals
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This note was uploaded on 03/20/2012 for the course BIOLOGY 1305 taught by Professor Adair during the Spring '09 term at Baylor.

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

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