A worldwide survey of intelligence test scores showed that there were significant gains in average IQ scores in 14 nations in just one generation. These results provide support for environmental influences on IQ scores because:
A) the amount of time involved is far too short for genetically influenced changes to have occurred.
B) genetics make little or no contribution to IQ scores.
C) evolution only occurs in nonhuman animals.
D) the amount of time involved is far too long for genetically influenced changes to have occurred.

Question

Quizplus · Accepted Answer

The fact that these gains in IQ scores occurred in just one generation suggests that environmental influences, such as changes in education, nutrition, or technology, are the most likely explanation. This is because it is unlikely that genetically influenced changes would occur or become apparent in such a short period of time. Choice B is not correct because genetics do play a role in determining IQ scores, but it is just one factor among many that influence intelligence. Choice C is not relevant to the question of environmental influences on IQ scores. Choice D is incorrect because, as mentioned, the time involved is actually too short for genetic changes to have occurred, not too long.

A Worldwide Survey of Intelligence Test Scores Showed That There