MENDELIAN SEGREGATION 23 
The two pairs of chromosomes “assort” on the 
spindle in either one of the two ways shown in the 
diagram; resulting in four and only four kinds of 
gametes. . 
qb | (1D ep 
CoC] Ca 
i 
00 
Cc» 
> 
00 
LONG GRAY LONG GRAY LONG GRAY LONG GRay 
aii C— | ci ea 
a iam) 
LONG GRAY | LONG EBONY LONG ‘ GRAY LONG EBONY 
Cc CH | Cc ae | GS CC | as a 
ci > | ci CS | a Cc | a CS 
LONG GRAY LONG GRAY VESTIGIAL GRAY VESTIGIAL «GRAY 
ce 
Jac | Ce | CD C~/ am exp 
CIID a | CID emp | a CD 
’ LONG GRAY LONG EBONY VESTIGIAL GRAY VESTIGIAL EBONY 
Fig. 12.—Diagram to show the 16 possible kinds of permutations of 
the four kinds of gametes of Fig. 11. Along the top line are four kinds 
of eggs; along the left side are four kinds of sperm; in the squares are the 
combinations formed by the meeting of each kind of egg with each kind 
of sperm, giving 9 long gray; 3 long ebony; 3 vestigial gray; 1 vestigial 
ebony. 
The process just described takes place both in the 
male and in the female. Consequently there will 
be four kinds of eggs and four kinds of spermatozoa, 
