■96 



T. H. MORGAN AND ELE TH CATTELL 



The reciprocal cross gave the following results: 



LRB c? by SWY 9 



Fi 



LRN 9 



SWY d" 



83 

 79 



9 (in one bottle) 



The expectation is as follows: 



Pi 



SWYbX - SWYbX 

 LRByX - ... by 



Eggs 



SWbyX - SWbYX - LRByX - LRBYX 



Gametes LWbyX - LWbyX - SRByX - SRBYX 

 of Fi 



SWbyX - SWYbX - . . .by - ...bY Sperm 



SWB 9 = 1 SWBr d^ = 1 



LWB 

 SWY 



9 = 1 

 9=3 



LWY 9=3 



LRB 9 = 1 



SRB 9 = 1 



LRN 9=3 



SRN 9=3 



LWBr d" = 1 



SWY d" = 3 



LWY c^ = 3 



LRB o" = 1 



SRB ^ = 1 



LRN d^ = 3 



SRN d^ = 3 



