spontaneous generation


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generation

 [jen″er-a´shun]
1. the process of reproduction.
2. a class composed of all individuals removed by the same number of successive ancestors from a common predecessor, or occupying positions on the same level in a genealogical (pedigree) chart.
alternate generation reproduction by alternate asexual and sexual means in an animal or plant species.
asexual generation (direct generation) production of a new organism not originating from union of gametes.
first filial generation the first-generation offspring of two parents; symbol F1.
parental generation the generation with which a particular genetic study is begun; symbol P1.
second filial generation all of the offspring produced by two individuals of the first filial generation; symbol F2.
sexual generation production of a new organism from the cell formed by the union of a male gamete (spermatozoon) and a female gamete (oocyte).
spontaneous generation the discredited concept of continuous generation of living organisms from nonliving matter.

spon·ta·ne·ous gen·er·a·tion

the false concept according to which living matter can arise through the vitalization of nonliving matter.
See also: biogenesis.
Synonym(s): heterogenesis (3)

spontaneous generation

spontaneous generation

spon·ta·ne·ous gen·er·a·tion

(spon-tā'nē-ŭs jen'ĕr-ā'shŭn)
The false concept according to which living matter can arise by the vitalization of nonliving matter.
See also: biogenesis
Synonym(s): heterogenesis (3) .

spontaneous generation

or

abiogenesis

a discredited belief that living organisms could arise from nonliving things that was finally shown to be untrue by PASTEUR in his famous swan-neck flask experiments.

generation

1. the process of reproduction.
2. a class composed of all individuals removed by the same number of successive ancestors from a common predecessor, or occupying positions on the same level in a genealogical (pedigree) chart. Said also of antibiotics or other chemicals derived from parent compounds.

alternate generation
reproduction by alternate asexual and sexual means in an animal or plant species.
asexual generation
production of a new organism not originating from union of gametes. Called also direct generation.
direct generation
see asexual generation (above).
filial generation (first)
the first generation offspring of two parents; symbol F1.
filial generation (second)
all of the offspring produced by two individuals of the first filial generation; symbol F2.
generation interval
the mean age of the parents when the animals that are to replace them are born.
parental generation
the generation with which a particular genetic study is begun; symbol P1.
sexual generation
production of a new organism from the zygote formed by the union of gametes.
spontaneous generation
the discredited concept of continuous generation of living organisms from nonliving matter.
generation time
1. in epidemiological terms the time required between infection occurring and the patient reaching full infectivity.
2. in histological terms the time required to complete one full cell cycle; average of 20 hours for mammalian cells.
References in periodicals archive ?
C], indicating spontaneous generation of infectious prions.
Doubts about the truth of spontaneous generation surfaced early in antiquity and coexisted with acceptance of it as a fact well into the seventeenth century.
The first chapter, "The Useless Genitor: Fantasies of Putrefaction and Nongenealogical Birth," interprets the beliefs in spontaneous generation, parthenogenesis, male pregnancy, and women's gestation of non-human fetuses as belonging to a neurosis related to inadequate scientific explanations.
The more John earnestly discovered the external contingencies of Pasteur's discovery, the less it was all about spontaneous generation "out there.
This spontaneous generation of area specialists was born hybrid.
He then immediately proceeds to pile up the positive evidence to refute the speculations and negative evidence of the spontaneous generation advocates, moving from species to species, first of trees and then of other plants such as fireweed and milkweed, to show the means by which each species is propagated.
23) Disseminated by writers such as Isidore of Seville and Albertus Magnus,(24) the doctrine of spontaneous generation was certainly familiar to Skelton.
The neat world in which wolves and deer, hawks and rabbits, bees and flowers kept each other's populations in balance and the world in harmony has gone to the old-age home of quaint ideas, to rest alongside spontaneous generation and astrology.
Economists assume that given the correct price "signals," conservation will appear by spontaneous generation.
They are Nicolo Leoniceno between the Arabo-Latin tradition and the Renaissance of the Greek commentators; Jean Fernel and his Christian Platonic interpretation of Galen; Jacob Schegk on the plastic faculty and the origin of souls; Cornelius Gemma and his neoplatonic reading of Hippocrates; Fortunio Liceti against Marsilio Ficino on the world-soul and the origin of life; and Daniel Sennert on living atoms, hylomorphism, and spontaneous generation.
Hempel also chronicles the development of germ theory, the debunking of spontaneous generation, and other advances in medical science that occurred during Snow's time.
David Mamet, Pulitzer Prize-winning playwright and author has remarked in Time magazine, "We're blessed, from time to time, with a spontaneous generation of humor and insight.

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