CHARACTERS OF DISTINCT PAIRS 99 



breed true, inasmuch as both of its characters are 

 recessive. 



The green rounds breed true to their recessive 

 character (greenness), but may or may not breed 

 true to their dominant one, roundness. There are, 

 therefore, two kinds of green rounds — a kind that 

 breeds true to both of its characters and produces 

 green rounds only, and a kind that breeds true to 

 colour but not to shape, and produces green rounds 

 and wrinkleds. Amongst every three green rounds 

 there will be one of the former and two of the latter 

 kind, on the average. 



The yellow wrinkled are in like case. They breed 

 true to their recessive character (wrinkledness), but 

 may or may not breed true to their dominant one 

 (yellowness). There are, therefore, two kinds of 

 yellow wrinkled, a kind that breeds true to both of 

 its characters and produces yellow wrinkleds only, 

 and a kind that breeds true to shape but not to 

 colour, and produces yellow and green wrinkleds. 

 Amongst every three yellow wrinkleds there will be 

 one of the former kind and two of the latter, on the 

 average. 



There are four kinds of yellow rounds : (1) A kind 

 that breeds true to both of its characters and produces 

 yellow rounds only ; of which kind there is one in 

 every nine on the average. (2) A kind that breeds true 

 to colour and not to shape and produces yellow rounds 

 and wrinkleds ; of which kind there are two in every 

 nine. (3) A kind that breeds true to shape but not to 

 colour, and produces yellow and green rounds ; of 



