When MZ twins show a high concordance rate for a trait and DZ twins show a low concordance rate for the same trait, then we can conclude that the trait is strongly affected by genetic variables.

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High concordance rates in monozygotic (MZ) twins compared to dizygotic (DZ) twins suggest a strong genetic influence on the trait, as MZ twins share nearly 100% of their genes while DZ twins share about 50%, similar to regular siblings.

When MZ Twins Show a High Concordance Rate for a Trait