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Heredity and Environment 



FIG. 103. MUTANTS OF Drosophila melanogaster. A-C, resulting from 

 mutations of genes in Chromosome Pair III; E-G, due to mutant genes 

 in Chrome-some Pair IV at the Loci indicated. A, "Bithorax" (III, 54.5). 

 B, "Ski" Wings (III, 43.5). C. "Delta" veins in Wings (III, 63.5). D, 

 "Roof" Wings (II, 77.0). E, "Bent" Wings (IV, o.o). F, "Shaven", 

 few hairs (IV, 0.5). G, "Eyeless" (IV, i.o) left, right, and dorsal 

 views. (Figures loaned by Professor Morgan.) 



