200 GENETICS IN RELATION TO AGRICULTURE 
Vermilion XXY Female 
XY Synapsis 167% 
8% VA \ 8% 
Reduction. 
Division V 
4% 40 4+42[ 44+42% 
fi (8) 
Fertilization 
by X Sperm |\]/V V V 
of Wild Male 
Dies (1) Wild Type Male(2) Wild Type Female (3) Wild Type Female (4) 
Exception 
Fertilization 
by Y Sperm y 
of Wild Male’ 
Vermilion Female (5) Dies (6) Vermilion Male (7) Vermilion Male (8) 
Exception 
Fie. 91.—Secondary non-disjunction in the female. Diagram showing the constitu- 
tion of an exceptional vermilion female, the two types of synapsis, reduction, and the 
four classes of eggs produced. Each kind of egg may be fertilized by either of the two 
(X and Y) kinds of sperm of the wild male, giving the eight classes of zygotes shown. 
(After Bridges.) 
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