3 8 Plant Genetics 



Fig. 5 shows that we are dealing with two homo- 

 zygotes, each producing only one kind of gamete, so 

 that all the hybrid progeny will be similar, both geno- 



FIG. 5. Diagram illustrating dihybrid ratio. Upper part shows 

 how original parents were crossed to give F t hybrid; lower part shows 

 F x hybrid producing four kinds of gametes ;, chance matings among these 

 gametes, when F x is inbred, results as indicated in the large set of squares 

 and explains the 9:3:3: i ratio in the F a generation. 



