Wrinkled, no tendrils 

 wt 



X Round, tendrils 



113 



wt 

 Round, tendrils 



wt 



+ + 



FIGURE 1 5-2 {Left) . Linkage between 

 nonallelic genes in the garden pea. 



Pj F, Round, tendrils (self-fertilized) 



FIGURE 15-3 (Right). Linkage be- 

 tween nonallelic genes in the garden 

 pea. The dihybrid parent was ob- 

 tained from the Fi in Fig. 15-2. 



F Round, tendrils x Wrinkled, no tendrils 



wt 



w t 



w t 



contributed by the dihybrid and 1008 did not. 

 The reciprocal crossover classes are appar- 

 ently equally frequent. So approximately 

 one crossover was produced for each 63 non- 

 cross9vers. The F2 results in Figure 15-2 are 

 consistent with this proportion, as you will 

 find if you work it out. 



It is also possible to make a dihybrid 

 for these genes which receives one mutant 



Round, tendrils 



Round, no tendrils 



Wrinkled, tendrils 



Wrinkled, no tendrils 



TOTAL 1024 



