The BEST evidence supporting the role of genetic factors in intelligence is provided by studies that compare
A)children to both their biological and adoptive parents.
B)identical and fraternal twins.
C)people born in different generations since the 1930s.
D)children raised in poverty and middle-class children.

Question

The BEST evidence supporting the role of genetic factors in intelligence is provided by studies that compare ​
A)children to both their biological and adoptive parents.
B)identical and fraternal twins.
C)people born in different generations since the 1930s.
D)children raised in poverty and middle-class children.

Quizplus · Accepted Answer

Studies comparing identical and fraternal twins are the best evidence for the role of genetic factors in intelligence because identical twins share 100% of their genes, while fraternal twins share about 50%, similar to regular siblings. This allows researchers to isolate the effects of genetics from environmental factors by comparing the similarities in intelligence between the two types of twins.

The BEST Evidence Supporting the Role of Genetic Factors in Intelligence