INHERITANCE OF SEX AND RELATED PHENOMENA 207 



as containing no factors, and the Z-chronmsomes, as containing either the 

 recessive factor / for lacticolor, or the dominant allelomorph L which con- 

 ditions the development of the grossulariata type. When lacticolor- 

 females from nature are mated to grossulariata males, FI consists of 

 grossulariata males and females of the genetic constitutions W(LZ) 



FIG. 94. Diagram illustrating the inheritance of lacticolor type in Abraxas. A 

 grossulariata female mated to a lacticolor male, the reciprocal cross of that represented in 

 Fig. 93. (Adapted from Morgan.) 



and (LZ)(IZ) respectively. The females are genetically the same as 

 those of a pure race of grossulariata. Abundant experimental evidence 

 demonstrates conclusively that not only are they themselves grossulariata, 

 but they cannot transmit anything but the grossulariata character to 

 their offspring. The F 2 consists of grossulariata males half of which are 



