Morgan was adopted as a newborn and has always lived with his adoptive family.Now,at age twenty,he discovers that he has an identical twin brother.According to research,Morgan's IQ score will be most similar to his ____.
A) adoptive mother
B) adoptive brother and sister
C) biological twin
D) biological mother

Question

Quizplus · Accepted Answer

Research on twins, especially identical twins, has consistently shown that genetics play a significant role in determining IQ. Identical twins, sharing 100% of their genes, tend to have very similar IQ scores, even when raised apart. This similarity is typically greater than the similarity between adoptive family members and the adopted individual, as the latter relationship does not share a genetic basis for IQ.

Morgan Was Adopted as a Newborn and Has Always Lived