8 4 



Heredity and Environment 



Fig. 26. Diagram Showing the Results of Crossing Yellow-seeded 

 (Lighter Colored) and Green-seeded (Darker Colored) Peas. (From 

 Morgan after Thompson.) 



seeded and green-seeded peas yielded when self-fertilized 6,022 

 yellow seeds and 2,001 green seeds, or very nearly three yellow to 

 one green (Fig. 26). The hybrids produced by crossing round 

 and wrinkled seeded varieties yielded in the second filial genera- 

 tion 5,474 round and 1,850 wrinkled seeds, or approximately three 

 round to one wrinkled (Fig. 30). The hybrids from tall-stemmed 

 and short-stemmed parents produced in the second filial genera- 



