E. C. PUNNETT 



229 



The Fs generation. 



The above hypothesis can be tested by the results of breeding the 

 various types which appeared for a generation further. For if it is 

 true, three of the F^ groups, viz. the yellows, the agoutis, aud the agouti- 

 blacks, should each consist of homogeneous material. We should be in 

 a position to predicate of the yellows that they are all heterozygous for 

 A, of the agoutis that tljey are all heterozygous for both A and E, and 

 of the agouti-blacks that they are all homozygous for E but hetero- 

 zygous for D and A. 



A. The Yellows. 



Seven F., does were mated to two ^2 bucks and the results, which 

 are tabulated in Table IV, shew that, as was to be expected on tiie 

 hypothesis, all nine were heterozygous for A. 



Male E 31 



Yellow Tortoise (Himalayan } 

 1 (3 



(- 



Totals 



73 



29 



B. The Agoutis. 



Of the F.^ agoutis five does and two bucks were mated together in 

 the way indicated in Table V. The results shew that all were hetero- 



?B 146 

 ?£188 

 iB 217 

 ?C 55 

 SC102 



TABLE V. 



Male B 104 ' 



Male D 125 



Hima- 

 Agouti YeUow Black Tortoise layan 



9 5 3 2 {— ) 



19 2 6 2 (— ) 



12 4 3 - (-) 



Agouti Yellow 



Hima- 



Black Tortoise layan 



- - (-) 



- - (-) 

 1 - (1) 



- - (1) 



40 11 



Totals 

 Expectation 



12 



46 Agouti 

 42-1 



{-) 

 12 Yellow 

 14-1 



C 1 



13 Black 

 141 



1 - (2) 



4 Tortoise 

 4-7 



' S B 104 was evidently homozygous for full-colour as opposed to Himalayan pattern. 



