Occurrence of different systems of gametic reduplication. 



15 



Lot No. 



Normal 

 yellow 



Normal 

 white 



Plain 

 yellow 



Total 



H. 33-112 

 H. 33-2'12 

 H. 33-3'12 



F, ex plain yellow 9 X Aojiku cf 



171 I 81 



121 6G 



27 I 14 



.350 



251 



55 



319 



161 



176 



H..^4-]'12 

 H. 34-212 



F,, ex Aojiku Q x plain yellow rf 



I 257 151 13(; 



289 130 141 



544 

 510 



Thus so far as the experiments are carried out to Fo generation 

 ill the Kneal direction, occurrence of a repulsion of very high, if not 

 absolute, intensity, cannot be doubted. If this hypothesis is working, 

 all normal yellow descendants in F2 and further generations would have 

 been produced only by union of gametes Ny and nY and thus indefinitely 

 remained heterozygous, while the normal white and plain yellow progeny 

 in the same series would have been always homozygous and bred true. 

 But this was not, as the following statements show, actually the case. 



As it was described in my previous paper'), the family N. 2'10 

 yielded l.'>4 normal yellows, 66 normal whites and 86 plain yellows in 

 1911. Each form of this zygotic series was mated inter se, and a 

 considerable number of progeny was obtained. Tlie i)edigree is put forth 

 graphically below. 



Though the nature of the original cross in the above series is 

 obscure, there is every possibility for the supposition that it was derived 

 from the cross between NyNy and nYnY. One more example in which 

 the parental forms were homozygous and the results were obtained up 

 to F3 generation is given below. 



») 1. c, p. 119. 



