SOME POSSIBLE BEARINGS OF GENETICS ON PATHOLOGY 3 



Fig. i. Cross between long-winged (wild type) Drosophila melanogaster 

 and vestigial-winged fly, producing long-winged offspring (Fi), which if bred 

 to each other give in the next generation 3 long to 1 vestigial. In the middle 

 of the diagram, the pair of chromosomes that are involved in this cross are 

 represented The chromosome with the factor (gene) for long wings is here 

 black; that for vestigial is open (v). 



