Ten pairs of monozygotic twins were tested for their ability to solve geometry problems.The highest score obtained was 46 points,while the lowest was 6 points.The variance in geometry test score within the twenty subjects (measured in points²)was 208.The covariance for test score between twins was 125.In this study,the broad-sense heritability of geometry problem-solving ability is: A)26%. B)32%. C)40%. D)60%. E)It is impossible to calculate.

Question

Quizplus · Accepted Answer

Broad-sense heritability (H^2) is calculated as the variance due to genetics (Vg) divided by the total phenotypic variance (Vp). In the case of monozygotic twins, the genetic variance can be estimated from the covariance between twins, since they share their entire genome. Therefore, H^2 = Vg / Vp = Covariance / Variance = 125 / 208 = 0.60 or 60%.

Ten Pairs of Monozygotic Twins Were Tested for Their Ability