D ? x R <? or R ? x D <J . . Parent-forms (P 1 ). 



D(R) . 



. Hybrid-offspring (F 1 ). 



3D 



i R . Generation of inbred hybrids 

 CF9. 



iD 



A 



i D 



2D(R) 

 I 



,4 



R R .(F*) 



i D + 2 D(R) 



D D R R R . (F 6 ) 



FIG. 47. MENDELISM. 

 (From J. A. Thompson," Heredity.") 



Or more shortly ; 

 D 

 D 

 D 



. P 3 great-grandparental generation. 

 . P 2 grandparental generation. 

 . P 1 parental generation. 



D(R) . . F 1 first filial (hybrid) generation. 



R 



R 



I 



R 



iDD 



i RR . F 2 s econd filial 



2D(R) 



" Extracted " pure Impure dominants. Pure recessives. (inbred) generation, 

 dominants. 



DD iDD 



2D(R) 



iRR RR 



F 3 third generation. 



I I I I I 



DD DD i DD 2D(R) i RR RR RR . F 4 fourth generation. 



FIG. 48. MENDELISM. 

 (From J. A. Thompson, " Heredity."} 



