Gi, Ga, G» —59— Gene Mutation 



Gamogenic. — Arising as a result of sexual fertilization. 



Gamogony. — Reproduction by means of special sexually- 

 differentiated cells (gametes). 



Gamorrt. — Gamefocyte, q.v. 



Gamopetalous. — Having the petals united. 



Gamophase. — The gametic phase of the life cycle ; the haploid 

 portion of the life cycle. 



Gamosepalous. — Having the sepals joined. 



Gamotropism. — Mutual attraction as between gametes. 



Geitonogamy. — Self-pollination in v^^hich the pollen is derived 

 from another flower on the same plant. 



Geitonogenesis. — Similarity of appearance acquired inde- 

 pendently and at about the same time by unrelated forms. 

 Adj. Geitonogenetic. cf. Hypogenesis. 



Gemmation. — The production of specialized buds which are 

 capable of developing into a new independent organism. 



Gemmule. — Pangen, q.v. 



Genasthenia, Theory of. — In addition to their accepted 

 qualitative properties, this theory attributes to the genes quan- 

 titative characteristics, or functional valency, which may be 

 reduced in a heterozygote or in a partly foreign plasma. 



Gene. — The unit of inheritance, which occupies a fixed chro- 

 mosomal locus, is transmitted in the germ cells, and which 

 governs, affects or controls the transmission and development 

 of a hereditary character. 



Gene Base. — See Protosome. 



Gene Centres. — See under Protosome. 



Gene Complex. — The balanced system of genes which con- 

 stitutes the 'internal environment' within which each gene 

 must act. The system is so balanced that the alteration of 

 any one gene affects the operation of many others (Ford). 

 The genetic background of a particular gene, comprising all 

 the genes which in any way react on, modify or affect the 

 character controlled by the gene in question. 



Gene-flow. — The spread of genes which takes place within 

 a group (variety, subspecies, or species) as a result of out- 

 crossing followed by natural crossing within the group. 



Gene Interaction. — The action of non-allelic genes upon each 

 other. 



Gene-locus. — Used by some as synonymous with gene and by 

 others to mean locus, q.v. 



Gene Mutation. — A heritable variation due to an alteration at 

 a definite locus on a chromosome. 



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