340 EXPERIMENTAL STUDY OF INHERITANCE 



The general results may be expressed in the following 

 scheme : — 



D?xRc? or R?xD(?. . Parent-forms (Pi). 



. Hybrid-offspring (FM. 



D(ro 



3D 



I! 



I R . Generation of inbred hybrids 

 (F-). 



I D 



D 



D 



D(n) 



3l> 



t D 



D 



2D(.;) 



3D 



iR 



I R R 



R 



(pa 



(F^) 



I D + 2D(r.) 



I 



D D D 



R R . (F5) 



The result of the hybridisation is a generation (pi) like the 

 dominant parent. They may be represented by the symbol 

 D(R), for they carry with them the possibility of having off- 

 spring with the recessive character ; that is to say, the recessive 

 character remains latent in the inheritance. 



When these D(R)s are inbred (self-fertilised, in the case of 

 peas) they have offspring (F^), some of which resemble the re- 

 cessive parent, while others resemble the dominant parent, and 

 these occur in the proportion of i : 3. When those resembling 

 the recessive parent are inbred, they breed true — i.e. they give 

 rise to a line of pure recessives. Those resembling the dominant 

 parent are all apparently alike, but theii subsequent history shows 

 that they may be divided into a set which breed true to the 



