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Auxocyte - 1. each cell in which ~ meiosis is incipient (= meiocyte or gonotocont) ; 2. the androcyte, sporocyte, or primary spermatocyte during the growth period. auxotrophic (Ryan & Lederberg 1946) - of nutritionally dependent cells, individuals, or strains ("auxotrophs") whose growth depends on a supplement to the basic food medium (minimal synthetic medium) in which -+ prototrophs are able to grow freely. Auxotrophs arise from prototrophs by ~ mutations causing one ("monoauxotrophs") or more ("polyauxotrophs") ~ genetic blocks.

Apoenzyme - the protein part of an ->- enzyme to which a coenzyme can attach. apogamety (Renner 1916) - ->- apomixis. apomixis. apogamogony (Fagerlind 1944) apogamy (de Bary 1877; Winkler 1908). - 1. = ->- apomixis (de Bary 1877). 2. The production of a sporophyte, not from the ovum but from other cells of the gametophyte ("euapogamy" according to Farmer & Digby 1907) or from cells of the sporophyte. A distinction is made between somatic (diploid) and generative (haploid) a. apomeiosis (Renner 1916) - sporogenesis without reduction of chromosome number during meiosis and giving rise to ->- apomixis.

These two extreme types are the rarest, the unbalanced intermediate types most common. The actual segregation ratios correspond in principle with those of -? trisomics, but as a rule, are strongly perturbed by irregularities of the chromosome distribution and by chromosome elimination; they are thus difficult to predict. 2. e. for the occurrence of four homologous chromosome sets, the prediction of segregation ratios is easier. The chromosomes of each group are present as -? quadrivalents, or otherwise, as two bivalents, one tri- and one univalent, or four univalents.

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