The Behavior of the Chromosomes as Studied through Linkage. 



261 



a result of the same mechanism. In Drosophila we have tested a large 

 number (over 40) of Mendelian genes, and they all fall into three gi-oups 



Table XII. 



Chromosome numbers reported for various forms that have been used 

 for studies in genetics. The haploid numbers are given. 



