R C. PUNNETT 



229 



The F, 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, and 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 they 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 ^2 does were mated to two F.2 bucks an<l the results, which 

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

 hypothesis, all nine were heterozygous for A. 



TABLE IV. 



Hale Bill 



Male En 



Yellow Tortoise (Himalayan) Yellow Tortoise (Himalayan) 



?B 79 

 ?B 93 

 ?JB169 

 ?£ 185 

 ?C 14 

 ?C 15 

 ?I>139 



13 

 12 

 18 

 10 

 12 



4 

 6 

 12 

 2 

 1 

 3 

 1 



(5) 

 (3) 



(-) 

 (4) 

 (3) 

 (4) 



(-) 



(- 

 (3 

 (- 

 (1 

 (- 

 (- 

 (- 



Totals 



73 



29 



B. The Agoutis. 



Of the Fi agoutis five does and two bucks were mated together in 

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



TABLE V. 



Male B 104 > 



Male D12S 



?£ 146 

 ?fil88 

 $£217 

 ?C 55 

 ?C102 



Agouti 

 9 

 19 

 12 



Yellow 

 5 

 2 

 4 



Black 

 3 

 6 

 3 



Hlma- 

 Tortoise laran 



Agouti Yellow Black 



Hima- 

 Tort<nae lajan 



1 — 



- (-) 



- (-) 



- (-) 



- (1) 

 (1) 



40 



Totals 

 Expectation 



11 



12 4 



46 Agoati 

 42-1 



(-) 

 12 Yellow 

 141 



6 1 



13 Black 

 141 



1 - (2) 



4 Tortoise 

 4-7 



' e B 104 was evidently homozygons for fall-colonr as opposed to Himalayan pattern. 



