What has been suggested by research on fraternal and identical twins?
A) The research has been mostly inconclusive.
B) Nearly all of the variation in memory scores may be accounted for by differences in the environment and upbringing.
C) More than half of the variation in memory scores may be accounted for by differences in genetic makeup.
D) Nearly all of the variation in memory scores may be accounted for by differences in genetic makeup.

Question

Quizplus · Accepted Answer

Research on fraternal and identical twins has shown that genetics play a significant role in memory, with studies suggesting that more than half of the variation in memory scores can be attributed to differences in genetic makeup. Identical twins, who share all of their genes, tend to have more similar memory abilities compared to fraternal twins, who share only about half of their genes, supporting the influence of genetics on memory.

What Has Been Suggested by Research on Fraternal and Identical