ALTERNATIVE INHERITANCE 



19 



than in this section which is concerned primarily with recording I\Ien- 

 dehan behavior. Cocoon colors often follow Mendelian proportions 

 but are not rigorously related as dominant and recessive to each other ; 

 and are not even rigorously alternative. 



It should be noted in this connection that whereas I have found 

 the larval color pattern characteristics to behave for the most part in 

 very satisfying Mendelian manner, being rigidly alternative in inheri- 

 tance and following in their transmission with close approximation the 

 Mendelian proportions, I have found the cocoon colors to be much less 

 consistent in behavior. 



Toyama on the other hand found both larval and cocoon characters 

 to be equally consistent and Mendelian in behavior. 



Larval Pattern and Cocoon Colors in the Same Matings. 



It is of interest to note the results in matings combining crosses 

 of opposed larval patterns and opposed cocoon colors at the same time. 



In the first place the occurrence of typical Mendelian two-pair 

 combinations may be noted ; as in crossings of Bagdad white larva, 

 white cocoon, with Italian Salmon, tiger-banded larva, salmon yellow 

 cocoon, where in first generation all the larvae are tiger-banded and all 

 the cocoons salmon, or white (see reference to this in section on Strain 

 and Individual Idiosyncrasies), with the second generation lots from 

 intermated hybrids breaking into 3 to i of tiger-banded to white larvae 

 and inside of each of these into 3 to i salmon to white {or ivhite to 

 salmon) cocoon lots. 



But I want particularly to call attention to the fact that in these 

 crossings of combined opposed larval and cocoon characteristics we 

 are dealing with characters of different life stages of the animals and 

 that we can often note the interesting fact of the offspring following 

 the paternal parent in a characteristic of one life-stage and the maternal 

 parent in a characteristic of another life-stage. For example the fol- 

 lowing is a type of the inheritance behavior of the larval and cocoon 

 characteristics in scores (hundreds indeed) of lots: J*Italian Salmon, 

 tiger-banded larva, salmon yellow cocoon, X $ Bagdad, white larva, 

 white cocoon ; produced all tiger-banded larvae and all white cocoons. 



Such examples only serve to bring out in still stronger relief the 

 fact that the inheritance behavior is a function of the character not of 

 the influence of the parent. 



In numerous other cases we find the inheritance in both larval 

 and cocoon characteristics agreeing in following a single one of the 



