358 EXPERIMENTAL STUDY OF INHERITANCE 



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 i860 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 



