In one study with both monozygotic and dizygotic twins, the concordance value for a neurological disorder was 100% for monozygotic twins. Which of the following statements is CORRECT?
A) The concordance value for dizygotic twins will be also 100%.
B) There will be no phenotypic variation in susceptibility for the disorder for all the pairs of twins in the study.
C) The concordance value for dizygotic twins will be 25%.
D) For dizygotic twins, all the variation in susceptibility for the disorder will be due to environmental factors.
E) Most of the variation in susceptibility for the disorder for monozygotic twins is likely due to genetic factors assuming that the concordance value for dizygotic twins is significantly less than 100%.

Question

Quizplus · Accepted Answer

Monozygotic twins share 100% of their genes, so a 100% concordance suggests a strong genetic component. If dizygotic twins have a lower concordance, it indicates genetic factors play a significant role.

In One Study with Both Monozygotic and Dizygotic Twins, the Concordance