LINKAGE OF TWO CHARACTERS IN THE FRUIT-FLY 



After Morgan 



Blackness and short wings in a male mutant are recessive to normal coloration and 

 normal wing. In the second hybrid generation these two characters do not become 

 segregated, but always come out together; as we should expect, "independent 

 assortment" takes place. It is inferred that the determiners lie close together in the 

 same chromosome 



