PRINCIPLES OF HEREDITY 



17 



have 1 : (1) Red uniting with red; (2) red with white; 

 (3) white with red; (4) white with white, or: 



1 RR 1 RW 1 WR 1 WW 

 Since RW and WR are alike, 



1 RR 2 RW 1 WW 



If we suppose that each plant produces only four seeds, 

 and that it follows the average, we should get the following 

 results, starting with one hybrid: 



First Generation 



Red Hybrid. 



Second Generation Third Generation 



(Pure White 

 Pure White 

 Pure White 

 Pure White 



(Pure White 

 Red Hybrid 

 Red Hybnd 

 Pure Red 



(Pure White 

 Red Hybrid 

 Red Hybrid 

 Pure Red 



/"Pure Red 



Pure Red.. ' g ure g^ 



| Pure Red 



[Pure Red 





1 RW 



1RR 2RW 1W 



6RR 4RW 6WW 



An interesting example of dominant and recessive 

 characters is in eye color in man. Dark color is dominant 

 over blue or light color. If a person has light-colored 

 eyes, it is evident that the dark color is not present, else 

 it would show. Those who have dark eyes may or may not 



'The pea is a self-fertilized plant. With cross-fertilized plants, the 

 mathematics is more complex. 



