Of the following,which is the strongest evidence that heredity is an important contributor to differences in intelligence?
A)Adopted children's IQ scores correlate positively with those of the adopting parents.
B)On average, IQ scores have been increasing from one generation to the next.
C)Monozygotic twins reared in separate families have similar IQ scores.
D)IQ scores tend to be consistent from childhood through adulthood.

Question

Quizplus · Accepted Answer

Monozygotic (identical) twins share nearly 100% of their genetic material, making them an ideal comparison for the influence of heredity on intelligence. If twins reared separately have similar IQ scores, it suggests that genetics plays a strong role in intelligence differences. Option A is a weaker form of evidence, as it is possible that adopted children share some environment and experiences with their adoptive parents that could influence IQ scores. Option B could be explained by factors such as improved nutrition and education rather than genetics. Option D suggests stability in individual IQ scores over time but does not necessarily demonstrate the influence of heredity.

Of the Following,which Is the Strongest Evidence That Heredity Is