SEX-LINKED LETHALS IN DROSOPHILA 



111 



chromosome from her father, bearing the factors for eosin (w«) 

 normal or non-lethal (L2) and miniature wings (m) . The possible 

 combination in the eggs of this Fi female are repeated here: 



^, fW 1 M —red lethal long 



Ps on-cross-ovcr \ „_ . .., 



I^w*" L m — eosin miniature 



W L m — red miniature 



w® 1 M — eosin lethal long 



Single cross-over < 



W 1 m — red lethal miniature 



[ w® L M — eosin long 



T., , , fVV L M— red long 



Double cross-over < „ , . , , , 



l^w^ 1 m — eosin lethal miniature 



TABLE 22 

 (Stock Lethal 11) 



* When Generation I was reached some of the red long daughters were bred 

 to eosin miniature males (instead of using white miniature as before (A-I) under 

 similar circumstances). Their offspring were as follows: 



Red long. Wh. min. Eos. min. Wh.long Red min. 



277 227 261 11 57 107 28 



The long red females were again selected and bred to eosin miniature males 

 to give generation J, K, L. Thus one generation is omitted in table 22, and 

 from the summaries which include table 22. 



