36 T. H. MORGAN 



males compared with the gray females. The analysis is as 

 follows : 



Yellow 9 bYBrX — bYBrJf 9 

 Gray cf BYBrX — bYBr (f 



Gray 9 bYBrX — BYBrX 9 



Fi <^a^»-i^ *©Twr (f bYBrX — bYBr 



d" 



p. Yellow 9 1 



' Yellow cf 1 



Gray 9 1 

 Gray c? 1 



Black by yellow 



Black females mated to yellow males give gray females and 

 males. The data for Fo are: 



5147 



2451 



1591 



750 



Yellow cf 1957 



Brown cf 530 



The expectation is for the females, gray 6, black 2; and for 

 the males, gray 3, black 1, yellow 3, brown 1. There are nearly 

 374 more gray females than 3 times the black females. There 

 are also 500 more gray males than yellow males. Both excessive 

 classes correspond to the Fi classes. There are more black females 

 than two times the black males. The analysis is as follows: 



Black 9 .ByBrX — ByBrX 9 

 Yellow d" bYBrX — bYBr d" 



Fi 



Gray 9 ByBrX — bYBrX 9 

 Gray cf' ByBrX — bYBr d^ 



Gametes of F: ^^^'^ " ^^'^'^ " "^^^^'^ " ^^'^'^ ^ 



t.ametesot±i BYBrX - ByBrX - bYBr - byBr cf 



Gray 9 6 Gray cf 3 



Black 9 2 Black cf 1 



Yellow cf 3 



Brown cf 1 



