INHERITANCE OF SEX AND RELATED PHENOMENA 207 
as containing no factors, and the Z-chromosomes, 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, /’, consists of 
grossulariata males and females of the genetic constitutions W (LZ) 
Fie. 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)(1Z) 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 grossularzata, 
but they cannot transmit anything but the grossulariata character to 
their offspring. The Fs consists of grossulariata males half of which are 
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