Which of the Following Is a Valid Statement Relating to Research

question 54

Multiple Choice

Which of the following is a valid statement relating to research concerning genetic influence on cognitive abilities?

• A) Fraternal twins have higher correlations on scores of cognitive functioning than do monozygotic twins.
• B) About 60 percent of the individual differences in cognitive abilities in older adults are environmental in nature.
• C) For general cognitive ability, heritability decreases with age.
• D) Meta-analyses of variance in IQ scores among twins suggest that 50 percent of the variance can be explained by genetic differences.

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