Jenny and Jason are fraternal twins. They have an older sister named Katy. Jenny and Jason were in the womb at the same time but are not the same gender. Jenny and Katy are both female, but Katy is older
Given these dynamics, what might you hypothesize about the correlation between their various IQ scores?
a. Jenny and Katy would have a high correlation of .75 because they are female siblings.
b. Jason and Katy would have a very low correlation of .20 because they are opposite genders.
c. Jason and Jenny would have a correlation a bit above. 50 because they are fraternal twins.
d. Jason and Jenny would be no more alike than Jason and Katy are.
C. One important conclusion from adoption and twin studies is that the more two people in a family are alike genetically, the higher the correlation in their IQs. Fraternal twins shared a gestational environment, so they are slightly more alike than siblings. Gender has nothing to do with IQ in this case.
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