One of the issues that complicates the interpretation of twin studies is that
A)fraternal twins are usually perceived as a "set" and play together more often than identical twins do.
B)identical twins represent a more active type of genotype-environment correlation.
C)the environments of identical twins are more similar than those of fraternal twins.
D)fraternal twins are rarely studied in comparison to identical twins.

Question

Quizplus · Accepted Answer

Fraternal twins share about 50% of their genetic material, whereas identical twins share 100% of their genetic material. However, both types of twins are often raised in similar environments. Therefore, any differences in outcomes between the two groups are more likely to reflect differences in genetics rather than differences in environment. However, identical twins are more likely to have very similar environments because people treat them more similarly than they do fraternal twins. This can complicate the interpretation of twin studies.

One of the Issues That Complicates the Interpretation of Twin