A Study of Susceptibility to Major Depressive Disorder in Monozygotic

question 41

Essay

A study of susceptibility to major depressive disorder in monozygotic twins separated at birth revealed that the broad-sense heritability of this trait is 0.10, and its total phenotypic variance is 0.25. What is the variance of the genotypic value of this disorder? Show your work.

---

Definitions:

Independent Variable

A variable that is manipulated to determine its effect on a dependent variable.

Critical T Value

The threshold value in t-testing that determines whether to reject the null hypothesis, based on the desired level of significance.

Significance

The likelihood that a relationship between two or more variables is caused by something other than random chance.

Slope

The slope is the measure of the steepness or incline of a line, defined as the ratio of the vertical change to the horizontal change between two points on the line.