'0 



EVOLUTION AND GENETICS 



vv 



EE 



VV 



ee 



/^ 



^A^ 



^ 



Fig. 27. — Diagram to show the indejiendent inheritance of two 

 pairs of factors, namely, gray (EE), vestigial (vv), and ebony 

 (ee), long (T^l"). The lower group of 16 flies represents the 16 

 recombinations in the second, F.„ generation, in the ratio of 

 9:3::3:1. 



