APPENDIX I 



Brpeding System, the organization of mating in a species or smaller group 

 which determines the degrees of similarity or difference between the 

 gametes which are effective in fertilization. Mather 1940. 



Bridge, v. Chromatid. 



Bud Sport, of a plant, Somatic Mutation, v. also Sport. 



BuRDO, an individual of the higher plants formerly supposed to be 

 produced by the fusion of two genotypically different somatic cells 

 and their nuclei. IVinkler 191 2. 



Cancer, a potentially unlimited renewal of growth in differentiated 

 cells, accompanied by their de-differentiation, and liable to be 

 followed by their migration (metastasis) which chiefly constitutes 

 malignancy. 



Carrier, an individual whose genotype allows it to carry an infective 

 organism without showing the symptoms to which individuals of 

 susceptible genotype of the same or another species are liable. 



Caste, a group of a species in social organisms distinct from other such 

 groups in mating habit and social function. In insects caste distinction 

 depends on food and sex differentiation, in man on endogamous 

 grouping. 



Cell (in the structure of animals and plants), the sphere of action of one 

 nucleus or of a group of nuclei (usually derived from one nucleus). 

 Also perhaps an enucleate body derived from such a unit. Hooke 

 1681. 



Cell Competition, Reimer Effect. 



Cell Selection, v. Selection. 



Cell Theory, that all organisms are wholly constituted of cells. 

 Conventionally attributed to Schleiden and Schwann 1840. 



Centre of Origin, Theory of, that the centre of origin of a wild or 

 cultivated species is found in the region of its greatest genetic 

 variation. Vavihv 1926. 



Centrogene, one of the similar and self-propagating units into which 

 the Centromere can be broken by X-rays or can break itself by 

 Misdivision. Darlington 1939. 



Centromere, a self-propagating particle in the chromosome thread whose 

 cyclical activity of protein organization, polarization, division and 

 repulsion determines certain movements of the chromosomes, 

 viz. tcrminalization, congression, orientation and separation: spindle 

 attachment, kinetochore, insertion region, etc. v. Acentric, Dicentric, 

 Misdivision, Polycentric, Structural Change, Telocentric. Darlington 

 1937- 



380 



