122 



HEREDITY AND SEX 



n 



A-E 



FIG. 61. I. Diagram of five pure lines of beans (A, B, C, D, and E) 

 and a population formed by their union, A-E. II. Diagrams illustrating a 

 pure line of beans and two new biotypes derived from it. The upper 

 diagram indicates the original biotype ; the second and third diagram in- 

 dicate the elongated (narrower) and shorter (broader) type of beans. X 

 indicates the average class of the original biotype. (After Johannsen.) 



