GROWTH DEVELOPMENT CHILD
MEASUREMENT OF INTELLIGENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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less than that between children and their biological parents.
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equal to that between identical twins raised together.
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equal to that between fraternal twins raised together.
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greater than that between ordinary siblings raised together.
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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%. For identical twins reared together the percentage goes up to 86%, while for identical twins reared apart the percentage drops slightly, to 76%.
Detailed explanation-2: -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-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: -Studies show that the correlations of IQ scores for identical twins reared together and for identical twins reared apart are both strong (. 86 and . 76, respectively).
Detailed explanation-5: -Studies of twins do in fact provide strong evidence for the heritability of intelligence; the scores of identical twins reared apart are highly correlated. In addition, adopted children’s scores are highly correlated with their birth parents and not with their adoptive parents.