T2 answers - Name Social Security General Psychology Honors...

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Name: ___________________ Social Security #: ___________________ General Psychology – Honors EXAM #2 ANSWERS SHORT ANSWER : Brief answers and bulleted responses are acceptable [40 points] Answer in space provided; if you use the back, please indicate that. 1. A researcher conducts a typical twin study to determine the genetic and environmental influences on the etiology of schizophrenia: a. The researcher recruits 500 pairs of MZ twins and 500 pairs of DZ twins, all of them raised together? What does MZ and DZ stand for, and what are the characteristics of these 2 pairs of twins? [2 points] MZ – monozygotic, identical (share 100% of genes) DZ – dyzygotic, fraternal (share ~ 50% of genes) b. If the concordance rate for schizophrenia among MZ twins is 75% and the concordance rate for schizophrenia among DZ twins is 30%, what can the researcher conclude? [2 points] That genetics influences the onset of schizophrenia, over and above environment. c. How does he justify this conclusion? What is it about twin studies that allow us to make these conclusions? [2 points] Since both sets of twins were raised with similar background, the only thing that can account for differences in the similarities between these twin pairs is the fact that MZ have same genes—thus genetics is important. d. If genetics fully accounted for the development of schizophrenia, what would be the concordance rate among MZ twins? [1 point] 100% e. Name at least ONE criticism of this twin study approach. [1 point] MZ twins are treated more similarly than DZ twins, thus this would mean that environment can account for differences in the concordance rates of MZ and DZ twins. Nonshared environmental effects not as apparent. 2. For each of the following scenarios, identify the four major elements of classical conditioning. Specifiy for each: a) the unconditioned stimulus (US), b) the conditioned stimulus (CS), the unconditioned response (UR), and d) the conditioned response (CR). [2 points each, for a total of 8 points] a. To discourage coyotes from attacking their sheep, ranchers feed the coyotes small pieces of mutton tainted with poison that, when ingested, cause the coyotes to experience extreme dizziness and nausea. Later, when the coyotes 1
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are placed in the pen with the sheep, the mere smell of the sheep causes the coyotes to run frantically away from their former prey. b. As part of a new and intriguing line of research in behavioral medicine, researchers give mice saccharine-flavored water (a sweet substance that mice love) and then follow it up with an injection of a drug that weakens the mice’s immune systems. Later when the mice drank saccharine-flavored water, they showed signs of a weakened immune response. Research is currently underway
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This note was uploaded on 06/08/2012 for the course PSY 9856 taught by Professor John during the Spring '12 term at North Central Texas College.

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T2 answers - Name Social Security General Psychology Honors...

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