ZOOLOGY: T. H. MORGAN 
423 
FIG. 2. DIAGRAM OF INHERITANCE OF COLOR BLINDNESS IN MAN. THE COLOR BLIND 
EYE AND THE X CHROMOSOME THAT CARRIES THE FACTOR FOR COLOR BLINDNESS ARE 
REPRESENTED IN SOLID BLACK. IN THIS DIAGRAM THE CHARACTER ENTERS THROUGH 
MALE. 
9' 
9 c? 
,^0^^!^ 
XX 
9 9 
cr 0' 
2^ 
MX 
IX XX 
I I or PARENTS 
EGGS 
j) SPERM ■ 
xc 
FIG. 3. AS IN FIG. 2. BUT HERE THE COLOR BLINDNESS ENTERS THROUGH THE 
FEMALE. 
