Similarities Between Adopted Persons and Their Genetically Unrelated Adoptive Parents

Multiple Choice

Similarities between adopted persons and their genetically unrelated adoptive parents indicate that environmental factors affect a particular characteristic; similarities between adopted persons and their biological parents indicate that genetic factors influence the characteristic.
-What assumptions underlie the use of adoption studies in genetics?

A) Adoptees have no contact with their biological parents after birth.
B) The foster parents and biological parents are not related.
C) The environments of biological and adopted parents are independent.
D) All of the above.