356 EXPERIMENTAL STUDY OF INHERITANCE 



Dominant. Recessive. 



Maize. " Starch " seed. " Sugar " seed. 



Nettles (Urtica 

 pilulifera and 

 U. dodartii). Serrate leaf margin. Entire leaf margin. 



Mirdbilis jalapa 



and M. rosea. Rose colour. Other colours. 



Mice. Coloured coat. Albino coat. 



Normal. " Waltzing " variety. 



Rabbits. Coloured coat. Albino coat. 



Angora fur. Short fur. 



Poultry. " Rose " comb of Ham- High serrated " single " 



burghs and Wyandottes. comb of Leghorns and 

 Andalusians. 



Cattle. Hornlessness. Horns. 



Snails. Bandless shell. Banded shell. 



Other Instances in Plants. As is well known, there are 

 two almost equally common forms of wild primrose : (A) thrum- 

 types, with short styles and with anthers at the top of the 

 corolla-tube ; and (B) pin-types, with long styles and with anthers 

 half way down the tube. The thrum-type is dominant over 

 the pin-type. 



The original species of Chinese primrose (Primula sinensis) 

 has a palmate leaf. About 1860 a sport arose (from seed) which 

 had a pinnate or " fern " leaf. The palmate form is dominant, 

 and the fern leaf is recessive. 



The deformed " Snapdragon " variety of sweet pea behaves 

 as a recessive to the normal type. 



The 2-row barley has certain lateral flowers which are ex- 

 clusively staminate ; in 6-row barley all the flowers are staminate 

 and pistillate, and all set seed. Mr. Biffen crossed these forms, 

 and found that the more negative character was dominant. 

 The offspring were 2-rowed. 



Maize. When the common or starchy round-seeded maize 

 is crossed with the wrinkled-seeded sugar-maize, the round 



