176 INBREEDINa AND OUTBREEDING 



velop to twice the extent of either parent, because there 

 are present eighteen different factors instead of nine. 



TABLE VII 



Composition of a Mendblian Thi-Htbeid in Fj Where the Development 

 Which Each Individual Attains Depends upon the Number op 

 Heterozygous Chromosomes Contained and Thereby upon the 

 Total Number op Different Factors Present. 



Following this hypothetical case into the second gen- 

 eration by selfing or by interbreeding the individuals of 



