Gj, Gg, Gg. — First, second and third self-bred generations. 



Galton's Law. — An individual derives his characters as fol- 

 lows: 1/4 from each parent, 1/16 from each grand-parent, 

 1/64 from each great-grand-parent, and so on. 



Gametangium. — Any structure in which gametes are formed. 



Gametes. — Cells, typically of meiotic origin, formed in the 

 sexual organs, or their equivalent, and specialized for fer- 

 tilization. 



Gametic Incompatibility. — A form of homomorphic incom- 

 patibility (q.v.) in which the incompatibility reaction depends 

 directly on the relation existing between the genetic consti- 

 tution of the zygote producing the female gamete and the 

 genetic constitution of the male gamete, cf. Zygotic Incom- 

 patibility (cf. Mather). 



Gametic Lethal Factor. — A gene which renders inviable a 

 gamete which carries it. 



Gametic Mutation. — A mutation occurring during gamete 

 formation. 



Gametic Number. — The number of chromosomes in the nuclei 

 of gametes. 



Gametic Reduction. — Meiosis which takes place immediately 

 prior to fertilization. 



Gametic Sterility. — Sterility due to the production of de- 

 generate non-functional gametes; haplontic sterility. 



Gametocyte. — A gamete mother-cell, or gametogonium. 



Gametogenesis. — The formation of gametes. 



Gametogenic. — Arising from spontaneous changes in chromo- 

 somes of gametes (Henderson). 



Gametogonium. — A gametocyte or gamete mother-cell. 



Gametophyte. — The haplont or haploid plant from which the 

 gametes arise in types showing an alternation of generations. 



Gamic. — Fertilized. 



Gamobium. — The sexual generation where there is an alter- 

 nation of generations. 



Gamogenesis. — Reproduction by sexual fertilization. 



