NORMAL x WALT; 



ALL NORMAL 



X 



SIMILAR HYBRIDS 



--(HYBRID OFFSPRING 

 FIRST FILIAL GENERATION) 



25 P C PURE NORMAL 

 X NORMAL 



5O P.O. IMPURE NORMAL 

 X OTHERS LIKE THEMSELVES 



YIELD 



PURE 



NORMALS 



25 P.C. 



PURE 



NORMAL 



5O P.C. 

 IMPURE 

 NORMAL 



X WALTZERS 



25 P.C. 



PURE: 

 XX/ALTZERS 



YIELD 



PURE 



WALTZERS 



(SECOND FILIAL 

 GENERATION^ 



(THIRD 



FILIAL, 

 GENERATION) 



MENDELISM IN MICE 



X 



Fi 



R A 



X 



V 



\\ RR 



JkV 



MENDELIAN INHERITANCE IN ANDALUSIAN FOWLS . 

 (After Darbishire.) 



P, the parents, black (dominant) and white (recessive). 



Pi, the hybrid generation, "blue" ' Andalusians, illustrating imperfect dominance. 



Fa, the second filial generation: 25 percent, pure blacks ("extracted pure dominants"), DD; 50 per cent, "blues "(impure dominants), 

 D (R) ; and 25 per cent, whites (extracted recessives), with occasional black spots (RR). 



