Dr. Jonas is a genetic researcher. She looks at the similarity in personality variables for fraternal versus identical twins. When she reports that identical twins are more similar than fraternal twins, she is really giving you information about

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Concordance refers to the degree to which related individuals (such as twins) show similarity in specific traits or behaviors. When Dr. Jonas reports that identical twins are more similar than fraternal twins in terms of personality variables, she is discussing the concordance rates between these groups, which can suggest the influence of genetic factors on these traits. Identical twins share more of their genetic makeup than fraternal twins, leading to higher concordance rates for genetically influenced traits.

Dr Jonas Is a Genetic Researcher