Analysis of Hetekogeneity in Complex Characteks 257 



From F5 to F^o the same method of mating and selection of parents was followed, 

 giving a race of constantly decreasing variability, and, as far as amount of 

 pigment was concerned, much above that of the normal parent stram. In F7 

 there appeared 1 male entirely black above on the pronotum, but not on the 

 sides. This individual was separated and tested separately. 



FioJ ^ ^ 



no. 42.— Diagrammatic reptMentatlon of the e«»"J» "^''J ',''"°? ewTSt 

 selection In permanently altering tfie type of this race. 



In Fe two matings were made ; one (A) continued the intensely selected strain 

 through to F,o; the other (B) was a random mating from all classes and was 

 aUowed to inbreed freely. Figure 42 shows, without further comment, the 

 result. The selected race was kept up to the standard, the nonselected at once 

 began to move backwards and soon showed only the normal biotype 4 pattern. 



