Question 1

How can heritability be measured?&#10;a.Compare individuals with different degrees of relatedness.&#10;b.Eliminate one of the variance components.&#10;c.Analyze regression observed from parents to offspring.&#10;d.All of the above methods can be used to measure heritability.

Accepted Answer

All of the listed methods (comparing individuals with different degrees of relatedness, eliminating one of the variance components, and analyzing regression observed from parents to offspring) can be used to measure heritability. However, different methods may be more appropriate for different traits or in different study designs. Therefore, using multiple methods can provide more robust and accurate estimates of heritability.

Question 2

What is the predicted response to selection Rif the narrow-sense heritability is 0.5 and the selection difference is 0.8?&#10;a.0.2&#10;b.0.4&#10;c.0.3&#10;d.1.3

Accepted Answer

Predicted response to selection (R) is given by the formula:
R = h² * S
where h² is the narrow-sense heritability and S is the selection differential.

Given h² = 0.5 and S = 0.8
R = 0.5 * 0.8
R = 0.4

Therefore, the predicted response to selection is 0.4. The correct answer is B.

Question 3

Which of the following is a limitation of heritability?
a.Heritability characteristics are universal.
b.Environmental factors cannot influence heritability.
c.Heritability does not test the degree that a trait is genetically determined.
d.All of the above are limitations.

Accepted Answer

Heritability measures the proportion of variation in a trait due to genetic factors in a specific population and environment, not the degree to which a trait is genetically determined.

Deck 16: Quantitative Genetics