THE Mi TATED OENE 



Central f< eld 



21 



Heat modification of width of central field in 

 percentage of wing breadth 

 24 28 32 36 40 44 48 52 56 60 64 68 



Inhibition of 



central field 



after operation 



Per cent animals 



20 40 60 80 100 



24 28 32 36 40 44 48 52 56 60 64 68 20 40 60 80 100 



& 



■ 11 



I I f 



Pi £fe ssfc 



Sysy 



st/st/ sysy 



jybsyd 



SybSydj Genotypes 



Normal extent of 'central field 



I ia 7. Influence of beal shocks of different genes and of then :auterinng 



wings upon the breadth of the field of symmetry in the pupae of the Hour moth 

 Left series ot curves: influence of heal shocks at different times in a t >n >< »• 1 

 segregating into 2 Sy < Irdinates: percentage of individuals, abei 



breadth ol area in percentage of entire \\ i 1 1 n . Right-hand curve: frequencj "t 

 incomplete formation of the same wing area after destruction of parts in per- 

 centage of animals operated at different agea. These ages correspond to those 

 for the curves on the left side. Below: type of wings belonging t" the different 

 points on the abscissa, The genes of the formulae produce the same effecl 

 genetically as otherwise produced by temperature shocks (phenocopii 

 Kuehn mill Henke, 1936, Abh Qet Wiu. Qoettingen, Fig. n»u 



