This discovery, however, remained unnoticed until 1900, 

 when DeVries of Holland, Correns of Germany, and 

 Tschermak of Austria rediscovered the laws simultaneously. 

 In this year too, Mendel's publication came to light. 



These laws have been stated as follows: 



1. *Tf two contrasted characters, which have pre- 

 viously bred true, are crossed, only one — the dominant 

 character — appears in the hybrid {Law of Dominance)." 



2. "In succeeding generations self-fertilized plants 

 grown from seeds from this cross reproduce both characters 

 in the proportion of three of the dominant character to one 



Fig. 14.— GREGOR MENDEL 

 about the year 1862. 



of the recessive character. Furthermore, the recessive 

 character continues for ever after to breed true, while those 

 plants bearing the dominant character are one-third pure 

 dominants, which ever after breed true to the dominant cha- 

 racter, and two-thirds hybrid dominants which contain 

 the recessive character in a hidden condition (Law of 

 Segregation." (Fig. 14). 



Explanationof the Laws. The results of his experiments 

 (see below) led Mendel to the conception of pairs of unit 

 characters, or allelomorphs, of which either can be carried 

 to any gamete or sex cell to the exclusion of the other. 



82 



