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 have 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 significant increases were observed in IQ scores in just one generation suggests that environmental influences, such as changes in education, nutrition and social factors, are the more likely explanation, as genetic changes would take much longer to manifest. Option B is incorrect as genetics do contribute to IQ but not exclusively. Option C is incorrect as evolution can and does occur in human populations. Option D is incorrect as it is contradictory to the time frame in the question.

A Worldwide Survey of Intelligence Test Scores Showed That There