If the heritability of a particular trait is found to be 60 percent,then by definition the other 40 percent is due to
A)random chance that impacts every organism.
B)prenatal environmental influences,such as toxins or viruses.
C)the effects of gene mutation.
D)differences in the individual's environment.

Question

Quizplus · Accepted Answer

Heritability refers to the proportion of variation in a trait that can be attributed to genetic factors. The remaining proportion of variation (in this case, 40 percent) is due to differences in the individual's environment, such as upbringing, nutrition, and experiences. Therefore, D is the correct choice. A is incorrect because random chance is not a systematic factor that can explain variation in a trait. B is incorrect because prenatal environmental influences would be included in the heritability estimate if they were found to have a genetic basis. C is incorrect because gene mutations are also included in the heritability estimate if they contribute to variation in the trait.

If the Heritability of a Particular Trait Is Found to Be