REPRODUCTION. 417 



and dwarf peas, for example, are crossed, all the seeds produce tall 

 plants. If the seeds from these tall plants are crossed with each other, 

 three-quarters become tall and one-quarter are short. In this case the 

 qualities of tallness and shortness have not fused, and the quality of 

 tallness is either present or absent. When it is present the plant is 

 tall, even though the quality of shortness is also present ; tallness is 

 said, therefore, to be a dominant, and shortness a recessive character, 

 [f the recessive character alone is present the plant is short. 



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27 



