If a trait has a heritability that is greater than zero, then the concordance rate for identical twins will be greater than for fraternal twins.

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If a trait has a heritability that is greater than zero, it means that genetics plays a role in the expression of that trait. Identical twins share 100% of their genes, while fraternal twins share on average 50% of their genes. Therefore, if a trait is heritable, we expect to see a higher concordance rate (the rate at which both twins exhibit the trait) in identical twins compared to fraternal twins.

If a Trait Has a Heritability That Is Greater Than