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 about 50% of their genes on average. Therefore, if a trait is genetically influenced, identical twins are more likely to be similar on that trait than fraternal twins.

If "Friendliness" Were a Genetically Influenced Trait, Identical Twins Would