Anthesis — 11 — Archigony 



Apogeny. — Sterility resulting from loss or destruction of 

 sexual organs. 



Apogyny. — Female sterility. 



Apolegamy. — Selective breeding. 



Apomeiosis. — The formation of a gametophyte with an un- 

 reduced chromosome number. 



Apomict. — An individual (race, species, etc.) which repro- 

 duces by apomixis, q.v. 



Apomixis. — Reproduction in which the sexual organs, or 

 related structures, take part, but in which there is no fertiliza- 

 tion so that the resulting seed is of vegetative nature (as op- 

 posed to amphimixis, q.v.) Adj. Apomictic. Apomixis in- 

 cludes Parthenogenesis, Apogamy and Apospory, q.v. See 

 under Reproduction. Apomixis is used by Cain (1944) in the 

 sense of the phenomenon of limited or no cross-reproduction — 

 the opposite of panmixy. 



Apopetalous. — Without petals; apetalous. 



Aporogamy. — Fertilization in which the pollen-tube, in reach- 

 ing the ovule, does not pass through the micropyle. 



Aposematic Coloration. — Warning coloration; distinctive 

 coloration associated with unpalatability or with other un- 

 pleasant characteristics tending to make the individual un- 

 attractive to a predator. 



Aposeme. — A group of unpalatable individuals all having 

 closely similar warning coloration {see Aposematic Colora- 

 tion), but not necessarily all of one species. 



Apospory. — Development of a gametophyte from an unre- 

 duced cell (not the spore-mother-cell) with a somatic chromo- 

 some complement. See under Reproduction. 



Apparato Reticolare. — The Golgi Apparatus, q.v. 



Apyrene. — Of spermatozoa: having no nucleus. 



A. Q. — Achievement quotient, q.v. 



Arber's Lave of Loss. — The general rule that a structure or 

 organ once lost in the course of phylogeny can never be re- 

 gained (Arber). 



Archallaxis. — An evolutionary change arising in early onto- 

 geny. 



Archebiosis. — Source of life; abiogenesis. 



Archespore, Archesporium. — The cell or group of cells 

 from which the spores are formed. Adj. Archesporial. 



Archetype. — The primitive type from which later types have 

 evolved. 



Archigenesis. — Abiogenesis, q.v. 



Archigony. — Abiogenesis, q.v. 



