296 REPRODUCTION 



9:3:3:1 



round yellow round green wrinkled yellow wrinkled green 



Two of these types are like the original parent in appear- 

 ance, but in addition to these, two new varieties have 

 been obtained, namely, wrinkled green and round yellow 

 peas. 



On Mendel's hypothesis this result, both as regards the colour 

 of the seeds and the proportion of each, is to be expected, as is 

 seen from the diagram below — 



Parent. Parent. 



RY X WG 



RY WG Fj generation, 



a round yellow pea, since ' round ' and ' yellow ' are dominant 

 to ' wrinkled ' and ' green ' respectively. 

 The gametes of the hybrid would be — 



Male. Female. 



RY RY 



RG RG 



WY WY 



WG WG 



The RY male gametes have an equal chance of meeting 

 with either, RY, RG, WY, or WG. 



