GROWTH DEVELOPMENT CHILD
MEASUREMENT OF INTELLIGENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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higherwhen they are raised together than when they are raised apart
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lowerthan that for fraternal twins raised together
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the same as that for any other bloodrelatives
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thesame whether they are reared together or apart
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Detailed explanation-1: -The correlation between intelligence test scores of identical twins is . higher when they are raised together than when they are raised apart. greater than that for fraternal twins raised together.
Detailed explanation-2: -The correlation of intelligence test scores for identical twins raised together is about +. 85. For fraternal twins raised together, it is about +. 60.
Detailed explanation-3: -Even when identical twins are adopted by two different families, their scores are very similar. Scans of identical twins’ brains reveal that gray-and white-matter volume is similar, and areas associated with verbal and spatial intelligence are virtually the same (Deary et al., 2009; Thompson et al., 2001).
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%.
Detailed explanation-5: -These studies showed that IQ is very heritable (although the environment still plays a role in determining your IQ). We can tell this because the IQ of identical twins are almost always the same and non-identical twins are only sometimes the same.