BIOLOGICAL BASES OF BEHAVIOR
PREDICTING INDIVIDUAL DIFFERENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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less than that between identical twins reared apart.
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equal to that between identical twins reared apart.
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less than that between children and their biological parents.
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equal to that between ordinary siblings reared 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: -According to twin studies, identical twins have more similar IQ scores than fraternal twins, and adoption studies show that adopted children have IQ scores that are more similar to their biological parents than to their adoptive parents.
Detailed explanation-3: -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-4: -They almost always have the same gender and many of the same physical characteristics (phenotypes). However, they may develop some genetic differences after the zygote splits, due to mutations in the DNA.
Detailed explanation-5: -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.