TESTING AND INDIVIDUAL DIFFERENCES
STUDYING GENETIC AND ENVIRONMENTAL INFLUENCES ON INTELLIGENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There is an environmental effect in intelligence
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There is a genetic effect on intelligence
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Either A or B
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None of the above
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Detailed explanation-1: -Knowing the intelligence score of one fraternal twin raised together with their sibling allows predicting the other twin’s score with an accuracy of 55%.
Detailed explanation-2: -The IQ correlation for identical twins raised apart is much lower than for fraternal twins raised together. children adopted in the early years attain IQs that, on average, match the scores of their adoptive parents’ biological children and the scores of nonadopted peers in their schools and communities.
Detailed explanation-3: -In this investigation, researchers found that identical twins raised together and identical twins raised apart exhibit a higher correlation between their IQ scores than siblings or fraternal twins raised together (Bouchard, Lykken, McGue, Segal, & Tellegen, 1990).
Detailed explanation-4: -It was concluded, among many other things, that identical twins are about 85 percent similar for IQ, whereas fraternal twins are about 60 percent similar. This would seem to indicate that half of the variation in intelligence is due to genes.