ZOOLOGY: T. H. MORGAN 
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and XY. There would be expected then, in all, four classes of eggs 
from an XXY female. These might be fertilized by the female pro- 
ducing sperm of a male with the results shown in (1), (2), (3), (4) of 
figure 6; or by a male producing sperm with the results shown in the 
lower line of the same figure (5), (6), (7), (8). If the XXY female 
were a white eyed female (her two white bearing X's are represented by 
POLAR BODY 
SPEW 
S • 6 ? DIES 
S 6 7 8 
FIG. 6. DIAGRAM TO ILLUSTRATE THE PRODUCTION OF FOUR CLASSES OF EGGS OF A 
WmTE EYED FEMALE THROUGH NON-DISJUNCTION, AND THEIR FERTILIZATION BY AN 
X-BEARING SPERM, GIVING ZYGOTES 1, 2, 3, 4; AND BY Y-BEARING SPERM, GIVING 
ZYGOTES 5, 6, 7, 8. 
