Bi, B2, Bs — 17 — Biological Race 



Basic Number. — The number of chromosomes found, or as- 

 sumed to have occurred, in the gametes of a diploid ancestor 

 (extant or extinct) of a polyploid. 



Basichromatin. — (i) A deeply staining type of chromatin 

 rich in nucleic acid, (ii) Chromatin. 



Basifixed. — Of anthers: attached to the filaments by their 

 bases. 



Basiphilic, Basophilic. — Staining readily with basic dyes. 



Bastard Merogony. — See under Merogony. 



Batesian Mimicry. — The resemblance of an innocuous species 

 to another species which is protected from predatory types by 

 unpalatability or by other qualities, cf. Mullerian — . 



Bathmic Force. — A hypothetical, inherent, adaptive growth- 

 force supposed to bring about variation and to control evolution. 



Batonette. — Part of the Golgi Apparatus, q.v. 



Bergmann's Rule. — Within a polytypic warm-blooded species, 

 the body-size of a subspecies usually increases with decreasing 

 mean temperature of its habitat (Huxley). 



Bigener, Bigeneric Cross. — An intergeneric hybrid. 



Bioblast. — A hypothetical, self-propagating, vital unit of 

 granular structure in the cytoplasm. 



Biocatalyzer. — Any substance, whether organic or inorganic, 

 which is biologically highly active. The biocatalyzers include 

 such substances as manganese and zinc and also enzymes, 

 ergones, vitamins and hormones. 



Biogen, Biogene. — See under Biophore. 



Biogenesis. — The doctrine of life from life, as opposed to 

 "Spontaneous" Generation. 0pp. Abiogenesis. 



Biogenetic Law. — The hypothesis that ontogeny recapitu- 

 lates phylogeny. See Recapitulation. 



Biogeny. — The study of evolution. 



Biologic Isolation. — The isolation of one species from its 

 congeners by reason of interspecific sterility, incompatibility, 

 preferential mating or differences in time of sexual activity. 



Biological Race. — (i) Such a "race may be said to exist 

 where the individuals of a species can be divided into groups 

 usually isolated to some extent by food preferences occurring 

 in the same locality and showing definite differences in biology, 

 but with corresponding structural differences either few or 

 inconstant or completely absent" (Thorpe, 1930). (ii) In 

 diseases the term denotes a strain which, though morphologic- 

 ally indistinguishable yet dififers from the normal in its patho- 

 genicity. 



