MENDELIAN SEGREGATION 



WHITE 



19 



RED 



Z't^.trZ^iill^J^Ll^I^^^^^ ^y '^^-^y?^ ^^^hJ^- ampelophila). 



The factors for these characters are carried by the X chromosomes, the 

 factor for red by the black X, and the factor for the white by the plain X 

 ine history ot the chromosomes is shown in the middle of the diagram' 



