VARIATION AND HEREDITY 133 



Crest in poultry. Absence of crest. 



Rose comb and Pea Single comb. 



comb. 



Extra toes. Normal four toes. 



Broodiness. Absence of this 



instinct. 



Unbanded shell in Banded shell, 

 wood-snail. 



PLANTS 



Dominant character. Recessive character. 



Peas : 



Tall stems. Dwarf stems. 



Yellow cotyledons. Green cotyledons. 

 Brown-skinned seeds. White seeds. 

 Round seeds. Wrinkled seeds. 



Wheat: 



Absence of awn. Presence of awn. 



Rough and red chaff . Smooth and white 



chaff. 



Keeled glumes. Rounded glumes. 



Flinty endosperm. Floury endosperm. 



Susceptibility to Immunity to rust, 

 rust. 



Barley: 



Two-rowed ears. Six-rowed ears. 



Nettles :- 



Markedly dentate Slightly dentate 

 leaves. leaves. 



So far we have stated facts the results of 

 experiment but Mendel also suggested an 



