Northocllne — 105 — Nyctigamous 



Nucleus. — The most constant constituent of animal and plant 

 cells which reproduces by mitosis and contains the chromo- 

 somes. 



Nulliplex. — Recessive ; used of the bottom recessive for a 

 given character in a polyploid (aaaa). 



Nullisomic. — An organism having the genetic formula 2n — 2, 

 i.e. a diploid individual lacking one chromosome-pair. 



Numerical Hybrid. — A hybrid produced by crossing two 

 plants with different chromosome numbers. 



Nyctanthous. — Of flowers; opening at night. 



Nyctigamous. — Of flowers: those which open at night and 

 close by day. 



