134 



The Journal of Heredity 



those that are completely lethal (such 

 as produce white seedlings) to those 

 that are non-lethal, producing- merely 

 a pale or light green plant. These dis- 

 coveries are pointing clearly to the 

 fact that while the hereditary units 

 (factors or genes) themselves are ap- 

 parently discontinuous units or enti- 

 ties, they are so numerous and often 

 their effects are so minute that they 

 appear to present a continuous series 

 when viewed as a whole. But inas- 

 much as we can isolate and study any 

 one of these numerous factors, their 

 actual unity is proven when they fall 

 into a definite system of heredity, as 

 they actually do. 



Summary 



An endosperm defect in sweet corn, 

 called sweet-defective, which arose in 

 an inbred Golden Bantam strain is 

 proven to be inherited as a simple, 

 Mendelian recessive. 



A distinct mutant involving another 

 endosperm defect arose in the third 

 inbred generation of the Golden Ban- 

 tam strain. Evidence indicates that 

 this could not have been in the stock 

 in previous years. 



Another recessive endosperm defect 

 was discovered in yellow flint corn. 

 This flint-defective type shows com- 

 plete linkage with albino seedlings. 



