When the concordance rate of a trait is significantly higher in identical twins than it is in fraternal twins, we can conclude that:

A. the trait has a strong genetic component.
B. the trait has a strong environmental
component.
C. the trait has a strong genotype-byenvironment
interaction.
D. the trait has a strong norm of reaction.
E. the trait has both a strong genetic
component and a strong norm of reaction.


A

Biology & Microbiology

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