APPENDIX I 



Germ Track (Keimbahn), the lineage of cells in the development of an 

 organism, particularly in animals, wliich are potential ancestors of 

 germ cells, as opposed to somatic cells. 



GoLGi Bodies, v. Chondriosomes. 



Gonad, an organ (testis or ovary) producing gametes in animals. 



Grading-up, improvement of an animal stock by using in successive 

 generations males from a superior stock only. 



Graft Hybrid, a Chimaera produced by grafting dissimilar plants. 



Grouping, the process of arranging measurements (for the purpose of 

 calculation) in such a way that those falling within a given range 

 are replaced by an equal number of hypothetical measurements at 

 the centre of that range. Sheppard's correction for grouping must 

 then be applied in calculating variances, to correct for the inflationary 

 effect of grouping. 



Gynandromorph, an individual of a dioecious species containing both 

 genetically male and genetically female tissues (not yet described in 

 plants). GoUschmidt 191 5. 



Gynodioecy, the condition of plant populations or species in which both 

 female {i.e. male sterile) and hermaphrodite individuals are found. 

 Cf. Androdioecy, Gynomonoecy. Darwin 1877. 



Gynogenesis, Pseudogamy in animals. Cf. Androgenesis. Wilson 1925. 



Gynomonoecy, the condition of plant individuals, or of species 

 having individuals, which bear both female [i.e. male sterile) and 

 hermaphrodite flowers. Cf. Andromonoecy, Gynodioecy. Dartvin 

 1877. 



Half-Mutation, v. Mutation. 



Haplogenotypic Sex-determination, causing Haploid Dioecy. Hartmann 



1918. 

 Haploid, v. Diploid. Strashmger 1905. 

 Haplophase, v. Diplophase. 

 Haplo-Polyploid, a plant derived by Haploid Parthenogenesis from a 



Polyploid, therefore having half its chromosome number. 

 Hemizygous, of genes which can occur in the diploid, when they are 



occurring in a haploid condition, as in male bees or the diflEerential 



segments of an X chromosome. Midler 1932. 

 Heredity, the process by which like begets like (chiefly in sexual repro- 

 duction). By extension the law or substance governing tliis process. 



V. Inheritance. Herbert Spencer 1863. 

 Pseudo-Heredity, resemblance between parent and offspring caused 



by external conditions, e.g. congenital syphyhs. 



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