. Dictionary of genetics, including terms used in cytology, animal breeding and evolution. Genetics. Achlamydeous —3— Allaesthetic Characters Agamete. — An undifferentiated cell used for reproductive purposes, as opposed to a sexually differentiated reproductive cell or gamete. Agameon. — A species consisting of only apomictic individuals (Camp & Gilly). Agamic, Agamous. — Having no pistils, stamens nor true seeds; reproducing asexually by apomixis, Agamobium. — The asexual generation of an organism having an alternation of generations. Agamogenesis. — Asexual reproduction by buds. Ag
. Dictionary of genetics, including terms used in cytology, animal breeding and evolution. Genetics. Achlamydeous —3— Allaesthetic Characters Agamete. — An undifferentiated cell used for reproductive purposes, as opposed to a sexually differentiated reproductive cell or gamete. Agameon. — A species consisting of only apomictic individuals (Camp & Gilly). Agamic, Agamous. — Having no pistils, stamens nor true seeds; reproducing asexually by apomixis, Agamobium. — The asexual generation of an organism having an alternation of generations. Agamogenesis. — Asexual reproduction by buds. Agamogony. — Reproduction by means of undifferentiated cells (agametes), as occurs in Protista and Thallophyta, as opposed to reproduction by means of sexually differentiated cells (gametes). Agamospecies. — Species which lack true sexual reproduc- tion. Agamospermy. — Seed production without fertilization. "Age and Area". — Willis's hypothesis that, other things being equal, species which have existed longest will occur throughout a greater area than species of more recent origin. Thus the localized distribution of an endemic species is ex- plained on the basis of its not having had time to spread, rather than on the theory that it arose as an adaptation brought about by peculiar local conditions. Agnation. — Relationship through the male line. Agonisis. — Certation; competition, as between pollen grains of different genotype, in the rapidity with which they can grow down the style. Agro-ecotype. — A group of agrotypes all having similar environmental preferences. Agrotype. — An agricultural race. Akaryote. — A cell lacking a nucleus. Akinete. — A resting cell. Albinism. — The absence of chlorophyll in a plant, or of pig- mentation in an animal. Albino. — An animal lacking pigmentation or a plant lacking chlorophyll. Albinotic. — Affected with albinism. Alecithal. — Of eggs: having little or no yolk. Aleurone. — The periphera
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