Grade . 

 Date. . 



EXERCISE 15 

 GRAPHIC REPRESENTATION OF MODES OF INHERITANCE 



Object. — To become familiar wdth methods of representing graphically 

 certain fundamental principles of inheritance. 



Equipment.— Drafting ink, red and black; lettering pen; facts concerning 

 the mode of inheritance of certain well defined characters; as, comb character, 

 plumage pattern, shank feathering, shank color, beak color, fifth toe, etc. 



Procedure.— Designate the inheritance of certain characters through 

 the Fl and F2 generations on the following diagrams. 



Step 1.— On the following diagrams plot at least three pairs of contrasted 

 characters without paying any attention to the question of dominance. 



Note.— See Productive Poultry Husbandry, pages 231 to 234, for expla- 

 nation of this and the following laws. 



The First Phase of Mendel's Law 



DDDDODDO^OoioO^^^ 



Ancestral Generatior 



ri Generatior 



F2 Genorati< 



57 



