. Dictionary of genetics, including terms used in cytology, animal breeding and evolution. Genetics. A. — Angstrom, mm. AI, All. — The first and second anaphases, respectively, in meiosis. Aberration. — An irregularity in chromosome distribution during heterotypic or homotypic cell division (Winters). Abiogenesis. — Spontaneous generation of living organisms from non-living matter. Abiogeny. — Abiogenesis, Abortion. — A miscarriage; arrested development of an organ. Acarpous. — Devoid of fruit. Acceleration. — The speeding-up of the time of action of a gene so that the character
. Dictionary of genetics, including terms used in cytology, animal breeding and evolution. Genetics. A. — Angstrom, mm. AI, All. — The first and second anaphases, respectively, in meiosis. Aberration. — An irregularity in chromosome distribution during heterotypic or homotypic cell division (Winters). Abiogenesis. — Spontaneous generation of living organisms from non-living matter. Abiogeny. — Abiogenesis, Abortion. — A miscarriage; arrested development of an organ. Acarpous. — Devoid of fruit. Acceleration. — The speeding-up of the time of action of a gene so that the character it controls develops earlier in the life cycle than it did in ancestral forms. Accessory Chromosomes. — Sex chromosomes, See, also, under W-, X- and Y-chromosomes. Accidental Evolution. — Evolution which confers no selec- tive advantage and which owes its origin to mutations of more or less neutral effect. Acclimation. — Adaptation to climatic change on the part of the individual. The physiological adjustment or increased tolerance shown by an individual organism to a change in the surrounding environment. Sec Acclimatization (Carpenter). Acclimatization. — The adjustment or increase in tolerance shown by a species in the course of several generations in a changed environment. See Acclimation (Carpenter). Acentric. — Lacking a centromere. Acentric-dicentric Translocation. — Aneucentric transloca- tion, Acentric Inversion. — An inversion of a segment of a chromo- some which does not involve the centromere, cf. Paracentric Inversion. Achievement Quotient. — The "educational age" divided by the "mental age". (The child is assigned to an "educational age" on the basis of tests made on subjects taught in school; for "mental age" see under Intelligence Quotient).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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