Twin studies show that monozygotic (identical) twins who are raised in separate homes have similar IQ scores. Such evidence:
A) Suggests that intelligence is partly influenced by heredity
B) Suggests that intelligence is partly influenced by environmental factors
C) Shows the interactive influences of heredity and environment on intelligence
D) Illustrates that the relative influences of heredity and environment on intelligence cannot be determined

Question

Quizplus · Accepted Answer

CThe similarity in IQ scores of monozygotic twins raised apart suggests a genetic component to intelligence, supporting the idea that heredity influences IQ (A). However, the fact that these scores are not identical also indicates that environmental factors play a role, leading to the conclusion that both heredity and environment interactively influence intelligence (C).

Twin Studies Show That Monozygotic (Identical) Twins Who Are Raised