When exploring the respective influences of heredity and environment in contributing to mood disorders, many researchers compare the instances of the disorders among the biological and adoptive families of people who have bipolar disorder. What do these comparisons show?
A) The contributions of heredity and environment are relatively equal.
B) There is little observable influence from either heredity or environment.
C) The influences of environment are stronger than those of heredity.
D) The influences of heredity are stronger than those of environment.

Question

Quizplus · Accepted Answer

These comparisons generally show that biological relatives of people with bipolar disorder are more likely to suffer from mood disorders than adoptive relatives, indicating that heredity has a stronger influence than environment in the development of bipolar disorder.

When Exploring the Respective Influences of Heredity and Environment in Contributing