H, E. Jordan 73 



to keep them from becoming lefthanded. Charts 60 and 62 both 

 contain a fraternity fulfilling expectancy from a DR x RR cross. 

 The following table summarizes the data for this group : 



The most probable assumption is that the parents involved are 

 heterozygotes. The sum ratio, 1 to 3'56, is very close to expectancy. 

 Sixteen fraternities actually show the 1 to 3 ratio ; and sixteen others a 

 1 to 4 ratio. Still other ratios are significantly close. This body of 

 data seems all but conclusive in showing the general recessive nature 



