122 



GENETICS 



In blending inheritance the offspring are seen to 

 be unhke either parent, because the parental deter- 

 miners fuse into a new thing. In alternative in- 

 heritance, on the contrary, the offspring may be 

 like either parent, since the characters in question do 

 not lose their individuality upon union, as shown in 

 the diagram. Only one or the other of the two 



Blending 



Alternative 



Particulate 



Characteristics 

 of parental 

 jermplasm as 

 Shovun in the 

 Somaplasm 



Double germplasm 

 termed from 

 Contributions 

 from both parents 



Possible kind* 

 of apparent 



dfsprinj this 



jermplasm 



maif produce 



Fig. 41. — Three kinds of inheritance described by Galton. 



mutually exclusive characters thus becomes effective 

 in determining the nature of each offspring. 



Finally, in particulate inheritance the double 

 germplasm which determines a new individual may 

 be imagined to undergo a diagonal rather than a 

 vertical cleavage upon maturation, thereby causing 

 unblended fragments of both parental characters 

 to become effective at once, in this manner producing 

 a mosaic offspring. 



