TRANSMISSION 



The second generation, bred from hybrids. When, however, 

 these hybrids were bred among themselves, the recessive charac- 

 ters came into evidence, constituting in all cases approximately 

 one fourth of the offspring, leaving the other 75 per cent to be 

 apparently dominant, actually, 25 per cent pure dominant and 

 50 per cent apparently dominant but really mixed. 



Thus, in Experiment i (as to form of seed), from 253 hybrids 

 7324 seeds were obtained in the second trial year. Among them 

 5474 were round or roundish and 1850 were angular, a ratio 

 of 2.96 to i. 



In Experiment 2 (as to color of endosperm), 258 crossed 

 plants yielded 6022 yellow and 2001 green, a ratio of 3.01 

 to i. 



Distribution of characters. In each of these experiments both 

 kinds of seed were usually found in the same pod \ showing that 

 the ovule, and not the pod, is the unit. Not only was that the 

 case, but the proportion of three dominants to one recessive 

 held only in the long run, and did not hold for individual plants, 

 as is seen in the following table giving the classification of the 

 offspring of the first ten plants in each experiment. 1 



From this it appears that the dominant always exceeds the 

 recessive in number, but that the proportion of 3 to r is 



1 Bateson, Mendel's Principles of Heredity, p. 53. 





