In order to explain principles of the differences in intelligence between and within groups,the authors described a hypothetical tomato plant experiment.Based on this experiment it would be accurate to conclude that
A)if differences within groups are at least partly genetic in origin,then differences between groups are also genetic.
B)the heritability of the differences between groups is 100 percent even though the within-group difference is due entirely to the environment.
C)the variation within each group will result from genetic differences,but the between-group difference is explained by the different care received.
D)heritability estimates are valid in regard to group differences but not in regard to the variance found within a group.

Question

Quizplus · Accepted Answer

The tomato plant experiment suggested that variations within each group are genetically mediated, while the differences between groups are due to the different environments each group experienced. This means that the variation within each group is due to genetic differences, as stated in option C. Option A is incorrect because it assumes that between-group differences are entirely genetic based on a partial genetic explanation of within-group differences. Option B is incorrect because it assumes that heritability is always 100% for between-group differences, which is not necessarily the case. Option D is incorrect because heritability estimates are valid for both within-group and between-group differences but the interpretation of what heritability means may be different.

In Order to Explain Principles of the Differences in Intelligence