Knight — 154 — Dictionary 



Unmatched S Gene. — Any S gene which is represented either 

 in the style or pollen but not in both, in a given pollination 

 (Lewis), (An S gene is any gene controlling the specificity 

 of incompatibility reactions in plants). 



Unreduced Apogamy. — Euapogamy; the development of a 

 sporophyte direct from a gametophyte without fertilization 

 having taken place so that no zygote is formed. See Partheno- 

 genesis. 



Uterus. — The organ in which the mammalian foetus is carried 

 during pregnancy. 



Uterus Masculinus. — A small structure lying between the 

 ejaculatory ducts of the male and homologous with the uterus 

 of the female; 'organ of Weber'. 



