A researcher uses a twin study to determine the influence of heredity on emotionality. If emotionality is influenced by heredity, the researcher will find that the level of emotionality is more similar in
A)sibling pairs than in identical twins.
B)fraternal twins than in sibling pairs.
C)fraternal twins than in identical twins.
D)identical twins than in fraternal twins.

Question

Quizplus · Accepted Answer

Identical twins share 100% of their genes, while fraternal twins share about 50%. Therefore, if emotionality is influenced by heredity, the level of emotionality should be more similar in identical twins than in fraternal twins. This is because any differences in emotionality between identical twins cannot be explained by genetic differences, since they have the same genes.

A Researcher Uses a Twin Study to Determine the Influence