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.
Correct Answer:
Verified
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