The fact that fraternal twins are more similar in intelligence than ordinary siblings suggests the importance of _____________?
Correct answer: B. common environmental factors.
- A. common hereditary factors.
- B. common environmental factors.
- C. genetic effects.
- D. effects of intrauterine environment.
Explanation
Fraternal twins are genetically no more alike than ordinary siblings, so their greater similarity in intelligence points to shared environmental influences, such as growing up together at the same age. It does not specifically demonstrate greater genetic similarity.
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