Intelligence test scores are LEAST similar for
A) nontwin siblings raised together.
B) fraternal twins raised together.
C) identical twins raised together.
D) identical twins raised apart.

Question

Quizplus · Accepted Answer

Nontwin siblings raised together have the least similar intelligence test scores compared to the other groups listed. This is because they share, on average, only about 50% of their genes, and while the shared environment contributes to similarities, genetic factors play a significant role in intelligence. Identical twins, whether raised together or apart, share 100% of their genes, leading to more similar intelligence scores. Fraternal twins also share a similar environment like nontwin siblings but have the added factor of being the same age, which can contribute to more similarities in experiences compared to nontwin siblings.

Intelligence Test Scores Are LEAST Similar for