138 



GENETICS 



over straight, represented by crooked and straight 

 lines respectively in the diagram. In other words, 

 the presence of pigment is dominant over the ab- 

 sence of pigment, while the factor that causes curli- 

 ness is dominant over the absence of this factor, 

 with respect to human hair. 



FIQ. 45. The heredity of human hair according to data by C. B. and 

 G. C. Davenport. The arcs represent the somatoplasms of four indi- 

 viduals. Within the arcs are the gametes formed by these individuals. 

 The dominant character is placed on the outside of the arc where it 

 will be visible. 



