Gene Interaction and Continuous Traits g-| 



8.7. In selecting for a quantitative trait, is the desired phenotype established in a pure line 

 more easily when dominance does or does not occur? Explain. 



8.8. Measure the length of ten lima beans to the nearest millimeter. Calculate the variance 

 of this sample. To what can you attribute this variance? 



8.9. Is it of any advantage to an organism to have a trait determined quantitatively, that is 

 by many gene pairs, rather than quahtatively, that is, by the action principally of one 

 or a few gene pairs? Why? 



