GENETICS 



When a homozygous individual with dark curly 

 hair crosses with a homozygous individual with light 



\\r\ f7 / / s ... 

 x V //--/ /-" / .- 



X \ v AA' / .'7 s 



O = Light 

 B <= Curly 

 = Straight 



FIG. 19. The heredity of human hair according to data by C. B. 

 and G. C. Davenport. The arcs represent the somatoplasms 

 of four individuals. 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. 



straight hair, all the offspring have dark curly hair. 



The dark curly-haired individuals of this second 



generation, however, are heterozygous with respect to 



