CHARACTERS OF DISTINCT PAIRS 103 



[2. Yellow wrinkled] — 



the 



recessive character in the above table to lay stress 

 on the fact that the recessive character is always 

 pure. 



To consider for a moment the practical application 

 of the facts which have now been set forth, it will 

 be seen that there are four combinations of characters 

 in this second hybrid generation, two of which are 

 different from the parent forms started with, namely, 

 the green wrinkled and the yellow round. Of these 

 four combinations only one type — that which possesses 

 two recessive characters, the green wrinkled — can be 

 counted on to breed true, straight away. We have 

 to wait no longer in this instance than the second 

 hybrid generation for a constant new variety. In 

 the case of the other three combinations, it is necessary 

 to wait till the next generation before we can be 

 certain of getting a constant type. For directly we 

 find a plant (bearing a fairly large number of seeds) 



