The similarity between the intelligence test scores of identical twins raised apart is

Greater than that between ordinary siblings reared together.

Explanation:

In Psychology, Twins are one of the things that is being studied. Twins genes and how they behave is different environment are been studied.

Well, things may be identical and they may not be identical that is Fraternal twins. Whether twins are identical or not is one of the reasons twins are being studied because it will have to do with their gene.

The other reason from studying twins is to know their Behavior at learning new things. This is done by studying them "Reared-apart". And the experiment yielded that the ''similarity between the intelligence test scores of identical twins raised apart is" much more higher than siblings (that are not twins) reared together.

Greater than that between ordinary siblings reared together

Explanation:

Identical twins raised apart have a higher correlation between their test scores than siblings or fraternal twins raised together.

The similarities in the test scores of identical twins shows the extent role of heredity in determining intelligence because the similarities that exist between these twin pairs can be attributed to genotype.