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 ?
Caption: Figure 6: Effect of spontaneous generation speed on equilibrium.
The evidence was clear: The theory of spontaneous generation was done for.
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.
Postcolonial criticism, unlike other modern critical developments, seemed to arrive by spontaneous generation.
Over the last two years there seems to have been a spontaneous generation of POs across the country, and the result is a growing body of knowledge about what it takes under a variety of circumstances to build POs.
When Pasteur discovered the microbe, the theory of spontaneous generation collapsed, and contagion became the new paradigm.
The spontaneous generation of behavior has reached the same stage as the spontaneous generation of maggots and micro-organisms in Pasteur's day" (Skinner, 1974, pp.
3) The spontaneous generation hypothesis maintained that rats suddenly emerged from rotting wheat, mice suddenly appeared from decaying rags, and amphibians were suddenly formed from mud and slime.
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.
Redi concluded that maggots did not arise by spontaneous generation but hatched from eggs laid by flies, eggs too small to be easily visible.

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