2o8 BREEDING 



To proceed now to the second row. The first 

 zygote in it, to the left, is a yellow round, YY.RW, 

 homozygous for colour but heterozygous for shape. 

 The second, YY.WW, is a yellow wrinkled, homo- 

 zygous for colour and, of course, homozygous for 

 shape, inasmuch as wrinkledness is recessive. The 

 third is another yellow round, heterozygous for both 

 colour and shape ; whilst the fourth and last, 

 YG.WW, is another yellow wrinkled, this time 

 heterozygous for colour. 



The first zygote in the third row, YG.RR, is a 

 yellow round, heterozygous for colour and homo- 

 zygous for shape. The second, YG.RW, is also a 

 yellow round, but heterozygous in both respects. 

 The third, GGr.RR, is a green round, homozygous, of 

 course, for colour, green being recessive ; whilst the 

 fourth and last, GG.RW, is a green round Hke the 

 last, but heterozygous for shape. 



The first zygote in the last row, YG.RW, is a 

 yellow round, heterozygous in both respects. The 

 second, YG.WW, is a yellow wrinkled, heterozygous 

 for colour only. The third, a green round, GG.RW, 

 heterozygous for shape only ; whilst the last is a 

 green wrinkled, homozygous for both of its characters, 

 both of them being recessive. 



This Table is now written again on p. 209 with 

 the visible characters of the zygotes, instead of their 

 formulae. 



It will be seen from this Table that there 

 are nine yellow round, three yellow wrinkled, three 

 green round, and one green wrinkled zygotes, 



