Payne: Variations and Selection 



23 



number of extra bristles which any of the pink flies have is 

 two, while among the normal flies there may be as many 

 as six extra bristles, among the black, five, and among the 



TABLE VII 



Summary of data from the cross. High selection line x black, pink, bent 



Xormal Bristles 



5 Bristles 



6 Bristles 



7 Bristles 



8 Bristles 



9 Bristles 



197 



241 



1S2 



72 



17 



2 





Normal 

 Bristles 



5 



Bristles 



6 



Bristles 



7 



Bristles 



8 



Bristles 



Xormal, wild type 



Black 



585 

 201 

 515 

 122 

 123 

 37 

 39 

 5 



460 

 154 

 76 

 106 

 30 

 29 

 6 

 1 



337 

 112 

 8 



114 

 7 

 9 

 1 

 1 



244 

 44 



110 

 18 



Pink 



Bent 



70 



19 



Black, pink 



Black, bent 



4 

 1 



3 



Pink, bent 



Black, pink, bent 















9 



Bristles 



10 

 Bristles 



11 



Bristles 



Mean 

 Bristle 

 Number 



Per Cent 



of flies 

 Wild Type 



Normal, wild type 



23 

 3 



3 





5.327 

 5.122 

 4.153 

 5.642 

 4.275 

 4.915 

 4.234 

 4.428 



33.20 

 37.78 

 85.97 

 26.93 

 76.87 

 44.57 

 82.97 

 71.42 



Black 





Pink 







Bent 



19 



2 



1 



Black, pink 



Black, bent 



1 







Pink, bent 







Blnok nink bpnf 









' ^ ' I 







Table VII gives a summary of the data from the cross of the selec- 

 tion line with black, pink, bent, both in Fi and in F2. It shows the distri- 

 bution of the extra bristles and the mean bristle number in the different 

 types in F2. It also shows that pink flies and flies with pink in combina- 

 tion with any other character have few" extra bristles. 



bent, seven. The same results are shown when pink is in 

 combination with any of the other characters. Since pink 

 is in the third chromosome and is recessive, all F. pink flies 

 must get both third chromosomes from the pink line. This 



