In looking at the relationship between heredity and IQ, which of the following is the most true?

Question

Quizplus · Accepted Answer

Research has shown that heredity appears to have the largest influence on adult IQ scores and this influence actually increases with age. This contradicts the earlier belief that heredity had the strongest impact on childhood IQ scores, which was based on the assumption that IQ scores were relatively stable throughout life. In fact, studies have found that IQ scores tend to increase during adolescence and early adulthood, before leveling off or declining somewhat in later adulthood. Additionally, research has consistently demonstrated that identical twins, who share 100% of their genetic material, are much more likely to have similar IQ scores than fraternal twins or siblings, supporting the idea that heredity plays a significant role in intelligence.

In Looking at the Relationship Between Heredity and IQ, Which