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

question 67

Multiple Choice

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%.

---

Definitions:

Sharpe Measure

A metric used to assess the performance of an investment by adjusting for its risk.

Excess Returns

Returns earned by an asset that exceed the risk-free rate of return, indicating the additional gain from taking on risk.

Risk-free Asset

A financial instrument that is considered to have no risk of financial loss, typically issued by a government.

Sharpe Measure

A method to evaluate the risk-adjusted return of an investment, comparing portfolio excess return to the standard deviation of the portfolio.