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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siblings raised together
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Identical twins raised together
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fraternal twins raised together
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Unrelated individuals raised together
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Detailed explanation-1: -The correlation of intelligence test scores for identical twins raised together is about +. 85. For identical twins raised apart, the correlation is about +. 72.
Detailed explanation-2: -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.
Detailed explanation-3: -Using the family-based adult sample, no differences in IQ scores were found between twins and their singleton siblings.
Detailed explanation-4: -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%. For identical twins reared together the percentage goes up to 86%, while for identical twins reared apart the percentage drops slightly, to 76%.