LINKAGE 



49 



with the normal allelomorphs of these factors. After 

 maturation one or the other of these chromosomes 



Fig. 21. — Back-cross of Fi cT (out of vestigial by black) by black 



vestigial 9 . 



will be left in each e^p; and each sperm. The gametes 

 will consequently contain the same combinations of 



