May, 1915.] The Chromosome Mechanism. 515 



If X = 5 and 2x = 10; 



Chromosomes a ♦ — ♦ n 

 b t — t o 



c T — T P 

 d • — • q 

 e ■ — ■ r 



The following gametes are possible : 



a a a a a n a a a n a a n a n n 

 b b b b o b b b o o b o b o b b 

 cccpcccppcpcpccc 

 ddqdddqqdddqddqd 



aanannannnannnnn 

 oolDobobboooboooo 

 p p p c p c p c c p p p c p p p 

 qdqqdqqqddqqqdqq 

 ererrerrrerrrrer 



From these 1024 combinations are possible, representing 243 

 constitutions. 



If X = 6 and 2x = 12; 



64 kinds of male or female gametes possible, 



4,096 chance combinations, 



representing 729 hereditary constitutions. 



If X = 7 and 2x = 14; 



1 28 kinds of gametes possible, 

 16,384 combinations, 

 representing 2187 constitutions. 



If x = 8 and 2x = 16; 



256 kinds of gainetes, 

 65,536 combinations, 

 representing 6561 constitutions. 



Ifx = 9and2x = 18; 



512 kinds of gametes possible, 

 262, 144 combinations, 

 representing 19,583 constitutions. 



If X = 10and2x = 20; 



1,024 kinds of gametes possible, 

 1,048,576 coinbinations, 

 representing 58,749 constitutions. 



