344 EXPERIMENTAL STUDY OF INHERITANCE 



Let us take the case of pea-plants with the quality of tallness 

 or dwarfness, of round seeds or angular seeds, of coloured seed- 

 coats or white seed-coats, of yellow or green cotyledons, or of 



® ®\ 



s ® ® ® 



® ®;(D 1, 



Fig. 35. — Diagram illustrating segregation of germ-cells. 



D', dominant parent, its ancestry — D-, D 1 ; R l , recessive parent, its ancestry— R% R» ; 



G and G, germ-cells ; Z, the zygote or fertilised egg-cell ; enclosed in the dotted line S S, 



the somatic cells of the developing body ; G 1 two germ-cells, one with a dominant character 

 and one with a recessive character ; dominance is indicated by the strong vertical stroke : 

 recessiveness (latent in the body S S) is indicated by the light horizontal stroke. 



