Final answer:
Identical twins are more likely to show similarity in IQ scores when reared together or apart compared to fraternal twins.
Step-by-step explanation:
When it comes to IQ scores, identical twins are more likely to show similarity when reared together or apart compared to fraternal twins. This is because identical twins share 100% of their genes, while fraternal twins share only about 50% of their genes on average, just like any other siblings.
An example of this is the Minnesota Study of Twins Reared Apart, which found that identical twins who were separated at birth and raised in different environments still showed a high degree of similarity in their IQ scores. Fraternal twins, on the other hand, did not show the same level of similarity.