A researcher is studying factors that influence political philosophy (conservative or liberal). She finds that adopted children are more likely to share their political philosophy with their adoptive parents than their biological parents

Which of the following should she conclude?
A) Genes have no influence on political philosophy.
B) Adoptive parents are more likely to be liberal.
C) Political philosophy has high heritability.
D) Political philosophy has low heritability.

Answer: D
Rationale: If adopted children are more like their biological parents than their adoptive parents on measures of traits such as personality and intelligence, this tells us that there is a strong genetic component to these traits. On the other hand, if the children are more like their adoptive, genetically unrelated parents, a strong case can be made that environmental factors outweigh the biological predispositions.