328 



APPENDIX 



All were sown the following year. Eleven of the round yellow seeds 

 did not yield plants, and three plants did not form seeds. Among 

 the rest: 



38 had round yellow seeds AB 



65 round yellow and green seeds ABb 



60 round yellow and wrinkled yellow seeds .... AaB 

 138 round yellow and green, wrinkled yellow and 



green seeds AaBb 



From the wrinkled yellow seeds 96 resulting plants bore seed, of 



which: 



28 had only wrinkled yellow seeds aB 



68 wrinkled yellow and green seeds aBb. 



From 108 round green seeds 102 resulting plants fruited, of which: 



35 had only round green seeds Ab 



67 round and wrinkled green seeds Aab. 



The wrinkled green seeds yielded 30 plants which bore seeds all of 

 like character; they remained constant ab. 



The offspring of the hybrids appeared therefore under nine 

 different forms, some of them in very unequal numbers. When 

 these are collected and co-ordinated we find : 



38 plants with the sign AB 



The whole of the forms may be classed into three essentially 

 different groups. The first includes those with the signs AB, Ab, 

 aB, and ab : they possess only constant characters and do not vary- 

 again in the next generation. Each of these forms is represented 

 on the average thirty-three times. The second group includes the 

 signs ABb, aBb, AaB, Aab: these are constant in one character and 

 hybrid in another, and vary in the next generation only as regards 

 the hybrid-character. Each of these appears on an average sixty- 

 five times. The form AaBb occurs 138 times: it is hybrid in both 



