344 EXPERIMENTAL STUDY OF INHERITANCE 



Let us take the case of pea-plants with the quaHty 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 



D' 



I 



G. ^ 



^-- 



® '~^, ® 



® ®-. 



R'' 

 I 



e 



®00®®;0;,.0 



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



D', dominant parent, its ancestry — D", 0=" ; R', recessive parent, its ancestry — R-, R^" j 



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



the somatic cells of the developing body ; G' 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. 



