THE GERM-PLASM THEORY 



305 



it was pointed out by Guyer (1902), Sutton (1903), 

 and others that the distribution of the adult char- 

 acteristics of hybrids which were found by Mendel 

 to reappear in the offspring in rather definite propor- 



\ 



FIG. 82. Diagrams to show the pairs of chromosomes and their be- 

 havior at the time of maturation of the egg. Three pairs of chromo- 

 somes are represented ; three from one parent, three from the other. 

 The six possible modes of separation of these three are shown in 

 the lowest line. (From Morgan, 191 4-) 



tions, could be explained if these characteristics are 

 located in the chromosomes. During synapsis, as 

 already explained (p. 44), homologous maternal and 

 paternal chromosomes are supposed to pair and then 

 separate in the reduction division. It seems probable 

 that the pairs of chromosomes do not occupy any 



