THEORY OF RESULTS 



207 



female gamete concerned, the formula of winch is 

 written at its end. Let us begin with the left-hand 

 square of the top row. This is a union between a 

 cJ YE, gamete and a ? YE gamete ; and the result, 

 YY.EE, is obviously a yellow round which is homo- 

 zygous both for yellowness and for roundness ; in other 

 words, both in colour and shape. All the zygotes 

 on the top row are yellow rounds. The second, 

 YY.EW, is, Hke the first, homozygous for colour, 

 but is heterozygous for shape. The third, YG.EE, 

 on the other hand, is heterozygous for colour but 

 homozygous for shape. Whilst the fourth and last, 

 YG.EW, is heterozygous for both colour and shape. 



YR 



B 



Of 



YW 



GR 



GW 



YR 



(J gametes 

 YW GR 



GW 



