EDdosome — 51 — Ergone 



Epigenesis. — The hypothesis that an embryo is a new crea- 

 tion which develops by gradual differentiation, as against the 

 concept of preformation, that the individual is present in 

 miniature, in the embryo and that the adult is produced merely 

 by expansion. 



Epigenetics. — The study of the causal mechanisms governing 

 the processes by which the genes of the genotype bring about 

 phenotypic effects (cf. Waddington, 1942). 



Epigenotype. — The complex of developmental processes link- 

 ing the genotype with the resulting phenotype (cf. Wadding- 

 ton, 1942). 



Episematic Coloration. — Coloration used for purposes of 

 recognition. 



Episomes. — Minute physical entities supposed to be attached 

 to the gene base (see protosome) to give the characteristic 

 action of the gene, such action being the result of the interaction 

 of the gene base with its episome or episomes. cf. Cytogene 

 (under Chromogene). 



Epistasis. — Dominance of one factor over another, the two 

 not being allelic. Such a dominant factor is said to be epistatic 

 and the non-allelomorphic recessive, hypostatic. 



Epistasy. — (i) Epistasis. (ii) The state when one of two 

 related types has undergone a greater degree of modification 

 in phylogeny than the other. 



Epistatic. — Dominant but non-allelomorphic; see Epistasis. 



Equation Division. — The nonreduction division in meiosis; 

 the homeotypic division. 



Equatorial Plate. — The group of metaphase chromosomes 

 lying at the equator of the spindle during nuclear division. 



Equilenin. — CjgHjgOg. A hormone found in the urine of 

 pregnant mares. 



Ergastic. — Of non-living metabolic products in a cell, such 

 as oil globules, oxalates, etc. 



Ergastoplasm. — Archiplasm, q.v. 



Ergatomorphic Male. — A sex-mosaic which occurs in ants 

 and which typically consists in the insect having the head, 

 thorax and gaster predominantly worker or female, and the 

 genetalia and antennae male. E-M-s are sometimes described 

 as antero-lateral gynandromorphs or intersexes. 



Ergines. — Organic biocatalyzers including enzymes, ergones, 

 vitamins and hormones. 



Ergone. — A term used to denote any substance with vitamin- 

 like or hormonic properties which cannot, with certainty, be 

 classed either as a vitamin or a hormone. 



