Eeactions and Products in Interspecific Crosses 



153 



(d) decemlineata in form, no lipoid color in any part, appearing translucent. 



(e) decemlineata in form, but in all other characters oblongata. 



(/) intermediate in form, and showing variable combinations of the characters 



of the two parent lines. 

 (g) oblongata in form, and in all other characters decemlineata in aspect. 

 (h) oblongata in form, with pronotal color of decemlineata. 

 (i) oblongata in form, without lipoid color, appearing translucent in color. 



There are three chief types that appear, decemlineata, intermediate, and 

 oblongata in form, all more or less complicated by the appearance of the char- 

 acters from both parents, so that the F^ array is most diverse in appearance. 

 This diversity is not limited to appearance, but is shown fully in the breeding 

 of these F^ types for Fj, which shows that the F^ fraternity is not a uniform 



heterozygous population at all. It is all heterozygous, but not all in the same 

 manner, so that out of an F^ array different mated pairs show many differences 

 in the production of F, and in the progeny produced. The character of the F^ 

 arrays is shown in table 19, which is the summation of 15 crosses between these 

 two species under the conditions of experiment, as far as the F^ arrays are con- 

 cerned. 



The breeding of these Fi types of heterozygotes shows that there are three 

 main types of action which are in the main coupled with the type that one starts 

 with in Fi. Those in which the decemlineata type is dominant in F^ shows 

 uniformly one type of reaction in this series ; those intermediate another, and 

 the set with oblongata form dominant still a third set of reactions in the produc- 

 tion of F2 and subsequent generations, which are in the main centered about the 

 reactions of the form-producing agents, and little or not at all concerned with 

 the color and pattern agents that may be present. 

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