90 T. H. MORGAN AND ELETH CATTELL 



SHORT, RED, BLACK BY LONG, WHITE, YELLOW 



When the female, SRB is mated to the male LWY all the 

 female offspring are long, red. gray; and the males are short, red, 

 gray. The results for the next F2 generation are given below: 



SRB 9 by LWY cf 



F, 



LRN 9 98 

 SRN c^ 80 



LRN 9 = 523 



LRN cf = 146 



LRB 9 = 110 



LRB cr' = 31 



SRN 9 = 292 



SRN cf = 242 



SRB 9 = 53 



SRB cf = 82 



LWY d" = 216 



LWBr d" = 40 



SWY cf = 85 



SWBr d^ = 30 



LWN d" = 2 



LRY cf = 1 



SRY o^ = 3 



SWB <f = 1 



The expectation is: 



SRByBrX - SRByBrX Short red black 9 



LWYbBrX - SWYbBr Long white yellow cf 



SRByBrXLWbYBrX Long, red. Gray 9 

 SRByBrXSWbYBr Short, red, Gray cf 



fSRBYBrX - SRByBrX - LWbYBrX - LWbyBrX \ 

 Gametes J LRBYBrX - LRByBrX - SWbYBrX - SWbyBrX /^^^^ 



F, 



of F, 



SRByBrX - SRBYBrX - SWbyBr - SWbYBr Sperm 



