Which of the following behavioral genetic methods provides the LEAST conclusive evidence that a trait is heritable?

Question

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Family studies provide the least conclusive evidence that a trait is heritable because they do not account for the shared environmental factors among family members. Genetics and environmental factors both contribute to the development of traits, so family studies cannot isolate the genetic component of the trait. Twin studies and adoption studies are more definitive methods because they allow researchers to compare the differences in traits between genetically identical individuals and those who share no genetic similarities, respectively. Selective breeding is also a conclusive method because it involves deliberately breeding animals with specific traits to examine the heritability of those traits.

Which of the Following Behavioral Genetic Methods Provides the LEAST