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21)The A, T, C, and G molecules in DNA code for the synthesis of: A)genes. B)amino acids. C)RNA. D)proteins. 22)Identifying a single gene has been compared to searching for someone when all you know is that the person lives: A)in Toronto. B)in Canada. C)in the western hemisphere. D)somewhere on Earth. 23)Studies that look for patterns of inheritance of genetic markers in large families in which a particular condition is common are called: A)experimental studies. B)psychometric studies. C)linkage studies. D)naturalistic observation studies. 24)Linkage studies are used to help determine: A)where a gene for a particular trait is likely to be located. B)whether people sharing the same trait have a genetic marker for that trait. C)a map of the human genome. D)where the boundaries between individual genes are located. 25)In the year ________ an international collaboration of researchers called the Human Genome Project and a private company, Celera Genomics, both announced that they had completed a rough draft of a map of the entire human genome. A)1985 B)1990 C)1995 D)2000 26)Which of the following best describes the relationship between genes and traits? A)Physical traits are usually determined by a single gene pair, while psychological traits are usually determined by multiple genes. B)Psychological traits are usually determined by a single gene pair, while physical traits are usually determined by multiple genes. C)Both physical and psychological traits are usually determined by multiple genes. D)Both physical and psychological traits are usually determined by a single gene. 27)Evolution is defined as a/an: A)interdisciplinary field of study concerned with the genetic bases of individual differences in behaviour and personality. B)process in which individuals with genetically influenced traits that are adaptive in a particular environment tend to survive and reproduce. C)change in gene frequencies within a population over many generations. D)interdisciplinary field that emphasizes genetic explanations of social behaviour in animals, including human beings. 28)Evolution is: A)a result of the ability of organisms to pass on acquired characteristics to their offspring. B)a change in gene frequencies within a population over many generations. C)caused by major climatic changes that cause some species to become extinct. D)a result of interbreeding of closely related species. 29)The process of evolution primarily affects: A)crossing over during the formation of a sperm or an egg. B)the replication of DNA across generations. C)the ways in which genetically influenced traits and characteristics of a population may change. D)individual differences in physical characteristics such as height and weight. 30)Natural selection ensures that: A)only the very strong members of a species will survive and pass on their genes. B)adaptive traits will become more common in the population. C)potentially new traits will not arise in the population. D)genes will not spontaneously change or mutate.

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