ALLELOMORPH 1C RELATIONSHIPS IN MENDELISM 



157 



linkage values of such a series of allelomorphs when tested with other 

 members of the group to which they belong should be identical. The 

 factor for yellow body color is located at the locus 0.0 in the X-chromo- 



AA 



CC 



AB 



BC 



Cl 



Bl 



FIG. 73. Forms and hybrids of Paratettix. AA, texanus; BB, leucorotus; CC, leuco- 

 thorax; II, nigro notatus. (After Nabours.) 



somes, and displays definite linkage values when tested with any other 

 factor belonging in this chromosome. The factor for spot gives exactly 

 the same values with all factors with which it has been tested. The 

 factors for eosin and white eye color both give one unit of crossing over 



