Fraternal twins reared together have less similar intelligence test scores than:

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genes, whereas fraternal twins share an average of 50%. Identical twins reared apart provide the best comparison for how genetics influence intelligence because they have the same genes but different environments. Therefore, fraternal twins reared together have less similar intelligence test scores than identical twins reared apart. Biological siblings reared together may have some genetic similarities but also have different combinations of genes, and adopted children may have no genetic connection at all. Parents and children also share genetic similarities, but the environment within which they are reared is not controlled for.

Fraternal Twins Reared Together Have Less Similar Intelligence Test Scores