If friendliness were a genetically influenced trait, identical twins would be more likely to be similar on the trait of friendliness than fraternal twins would be.

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genes while fraternal twins share only around 50%, so if friendliness were genetically influenced, identical twins would be more similar because they have the same genetic makeup.

If Friendliness Were a Genetically Influenced Trait, Identical Twins Would