Group V. 



91 



Linkage Experiments on Genes in Group V. 

 (Experiments 64 to 70.) 



Exp. 64. — Fused interrupted. 



Mating: fused X interrupted. 



6 cultures (E 788, 826, 953, 974, 1116-7). 



Non-cross-overs (fu 343 ; i 279) 622 



Cross-overs (fu i 64; + 233) 297 



Total 919 



Per cent cross-overs, fu-i, counting only i, 

 18.6. 



Exp. 65. — Fused branched. 



Mating: fused X branched. 

 2 cultures (E 606, 614). 



Non-cross-overs (fu 111; B 111) 222 



Cross-overs (fu B 28 : + 21) 49 



Total 271 



Per cent cross-overs, fu-B 18.0. 



Exp. 66. — Fused approximated. 



Mating: fused approximated X wild-type. 

 4 cultures (M 8-11). 



Non-cross-overs (fu and fu a 225; + 183) 408 

 Cross-overs (fu not a 13; a 97) 110 



Total 518 



Per cent cross-overs, fu-a counting only 

 not fu flies, 35.0. 



Exp. 67. — Interrupted branched. 



Mating: interrupted X branched. 



6 cultures (E 902, 924, 953, 974, 1116-7). 



Non-cross-overs (i 163; B 149) 312 



Cross-overs (i B 4 ; + 199) 203 



Total 515 



Per cent cross-overs, i-B, counting only i. 



2.4. 



Exp. 68. — Interrupted approximated. 

 Mating: interrupted approximated X wild-type. 



Per cent cross-overs, after apportioning doubtful flies, i-a 17. 



Exp. 69. — Branched ruffled. 



Mating: branched X ruffled. 



4 cultures (M 314, 353-4, 367). 



Non-cross-overs (B 97 ; ru 103) 200 



Cross-overs ( B ru 88; -fllO) 198 



Total 308 



Per cent cross-overs, B-ru 49.7. 



