In a study of concordance, a sample of identical twins was evaluated for adult-onset diabetes. The data below were collected for this trait:
1. In 36 identical twin pairs, both showed adult-onset diabetes.
2. In 40 identical twin pairs, only one showed adult-onset diabetes.
3. In 336 identical twin pairs, neither showed adult-onset diabetes.
The data above imply that the environment is not an important component of adult-onset diabetes.

Question

Quizplus · Accepted Answer

The presence of identical twin pairs where only one twin developed adult-onset diabetes (40 pairs) suggests that factors other than genetics, such as environmental factors, play a role in the development of the condition.

In a Study of Concordance, a Sample of Identical Twins