Alternative Inheritance — 7 — Anastomoses 



Amphimixis. — The union of maternal and paternal elements 

 in gametic fertilization. 0pp. Apomixis. 



Amphinucleolus. — A double nucleolus consisting typically 

 of a basophilic and an oxyphilic component in close associa- 

 tion (Wilson). 



Amphiont. — A zygote; the cell which results from gametic 

 fertilization and, by extension, the individual which grows 

 from this cell. 



Amphiplasty, — The loss of a satellite from a chromosome. 



Amphitene. — Zygotene; the stage in the prophase of meiosis 

 when homologous chromosomes come together in pairs; the 

 paired chromosome threads at this stage. 



Amphitoky. — Parthenogenetic multiplication by both sexes. 



Amphogenic. — Producing offspring consisting of approxi- 

 mately equal proportions of either sex. N. Amphogeny. 



Ampulla of Henle. — An enlargement at the distal end of 

 the vas deferens which acts as a storage place for spermatozoa. 



Amyloplasts. — Leucoplasts which take part in the conversion 

 of sugars to starch granules. 



Anaboly. — An evolutionary change arising at the end of 

 ontogeny. The adding, by a descendant, of a new stage on to 

 the last stage of morphogenesis of the ancestral type : a modi- 

 fied form of overstepping, q.v. "Anaboly differs from 'over- 

 stepping' only in that it is the final stage of morphogenesis 

 instead of the definitive adult stage of the ancestor which is 

 passed through in the ontogeny of the descendant" (de Beer). 



Anachromasis. — The changes which take place in a nucleus 

 during prophase. 



Anamorphism. — Anamorphosis, q.v. 



Anamorphosis. — The evolution of one type from another by 

 continuous variation as distinct from evolution brought about 

 by saltation. 



Anandrous. — Having no stamens. 



Ananthous. — Having no inflorescence. 



Anaphase. — The stage in nuclear division when the daughter 

 chromosomes diverge and begin to move towards the poles. 



Anaplast, Anaplastid. — Amyloplast, q.v. 



Anaschistic. — Bivalents that are said to split "longitudinally" 

 at the first meiotic division ; these are bivalents with chiasmata 

 close to the spindle attachment (as opposed to diaschistic) 

 (Farmer & Moore; Darlington). 



Anastomoses. — The fine threads which appear to connect 

 the chromonemata giving a net-like appearance in the resting 

 nucleus. 



