GROWTH DEVELOPMENT CHILD
COGNITION AND EMOTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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identical twins reared together
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fraternal twins reared together
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non-twin siblings reared apart
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non-twin siblings reared together
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Detailed explanation-1: -The mean correlation of IQ scores between monozygotic twins was 0.86, between siblings 0.47, between half-siblings 0.31, and between cousins 0.15.
Detailed explanation-2: -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-3: -It is empirically true that the cognitive abilities that are measured on IQ tests are positively correlated with each other, giving rise to a “general intelligence factor".
Detailed explanation-4: -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.