334 LUTHER BURBANK 



The precise result was this: (1) Smooth 

 yellow grains 2,869, or 25.3 per cent; (2) 

 smooth white grains 2,933, or 25.7 per cent; 

 (3) wrinkled yellow grains 2,798, or 24.5 per 

 cent; (4) wrinkled white grains 2,803, or 24.5 

 per cent. 



We have seen that the condition of whiteness 

 and the wrinkled condition (due to large sugar 

 content) are recessive traits. Therefore if we 

 plant the wrinkled white kernels we may ex- 

 pect sugar corn, the ears of which will be uni- 

 formly of that type. 



But what we wished to secure, it will be re- 

 called, was an ear bearing only yellow wrinkled 

 kernels. There are as many of these as of the 

 others on the ears of the second-generation hy- 

 brids. But they will not all breed true, because 

 yellowness is a dominant factor, and so in a cer- 

 tain number of the yellow kernels the quality of 

 whiteness exists as a recessive trait in hiding, 

 that will reappear in the next generation. 



All the progeny of yellow wrinkled kernels 

 will be wrinkled because the wrinkled condition 

 is recessive; but only about one in four of these 

 kernels will produce yellow progeny with 

 certainty. 



And no one can tell from mere inspection 

 which of the four is the pure dominant and 



