652 



VERMILION-DEFICIENCY 



in the facet to deficiency interval. There was again considerable 

 reduction in the crossing over between the deficiency and sable 

 which was here only 2.8 instead of 10.0 per cent. 



The cut vermilion forked male had been used in the mating just 

 described in order that in the next generation a closer analysis of the 

 crossover reduction immediately to the left of the deficiency might 

 be made. 



TABLE VII. 



Ofspring of Vermilion Females, Conslitiition 



June 28, 1916. 



ion I r- J. 



\ ~ sg J 



Considerable data have been collected showing the amount of 

 crossing over in females carrying cut vermilion and forked in one X 

 chromosome and deficiency sable garnet in the other (Table VII). 



The most significant crossover values calculable from the results 

 of Table VII are cut deficiency which is 11.1 instead of 13.0 — a de- 

 crease of 1.9 units, and deficiency sable which is 6.9 instead of 10.0 — 

 a decrease of 3.1 units. 



