Dr.Plymouth is testing the intelligence of the following pairs of twins: 1 - Penny and Benny are identical twins raised apart from birth
2 - Polly and Molly are identical twins raised together
3 - Perry and Kerry are fraternal twins raised together
Rank these twins according to those who would MOST likely score the same on the intelligence test to those who would LEAST likely score the same.
A) 2 - 3 - 1
B) 2 - 1 - 3
C) 3 - 2 - 1
D) 1 = 2 - 3 (i.e., 1 & 2 are the same and both are more similar than 3)

Question

Quizplus · Accepted Answer

Identical twins raised together (Polly and Molly) are most likely to score similarly on intelligence tests because they share 100% of their genes and have a similar environment. Identical twins raised apart (Penny and Benny) are less likely to score similarly because they were not raised in the same environment. Fraternal twins (Perry and Kerry) only share 50% of their genes, so they are the least likely to score similarly on intelligence tests. Therefore, the best ranking would be 2-1-3, indicating that Polly and Molly are most likely to score similarly, followed by the identical twins raised apart (Penny and Benny), and then the fraternal twins (Perry and Kerry).

DrPlymouth Is Testing the Intelligence of the Following Pairs of Twins