Difference between revisions of "Law of biogenesis"

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'''Law of [[biogenesis]]
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'''Definition'''
  
-->'''recapitulation [[theory]]
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''noun''
  
The [[theory]] formulated by E.H. Haeckel that [[individuals]] in their [[embryonic]] [[development]] [[pass]] through [[stages]] [[similar]] in [[general]] [[structural]] [[plan]] to the [[stages]] their [[species]] passed through in its evolution; more technically phrased, the [[theory]] that [[ontogeny]] is an abbreviated [[recapitulation]] of [[phylogeny]]. The [[theory]] has been discredited in the [[light]] of the modern [[science]] of [[genetics]]. Even at the [[time]], there was much [[reason]] to doubt its [[validity]].  Especially as Haeckel himself was [[ordered]] to appear before a [[university]] court in Jena were he was accused of faking the evidence for [[recapitulation]]. He [[finally]] admitted that his evidence had been 'doctored'.  Synonym: [[biogenetic law]], haeckels [[theory]], [[embryonic]] [[recapitulation]].
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(1) The [[principle]] stating that [[life]] arises from pre-existing [[life]], not from nonliving [[material]].
 
'''Law of [[biogenesis]].'''
 
The [[law]] which [[states]] that [[life]] [[arises]] from existing [[life]].
 
  
The [[ancient]] [[greeks]] believed that living things could originate from nonliving [[matter]] ([[abiogenesis]]) and that the [[goddess]] Gea could [[make]] [[life]] [[arise]] spontaneously from [[stones]]. [[aristotle]] disagreed, but he still believed that creatures could [[arise]] from dissimilar [[organisms]] or from [[soil]]. [[variations]] of this [[concept]] of [[spontaneous generation]] still existed as late as the 17th century, but towards the [[end]] of the 17th century a [[series]] of [[observations]], [[experiments]], and [[arguments]] began that eventually discredited such [[ideas]]. This [[advance]] in [[scientific]] understanding was [[met]] with much [[opposition]], with personal [[beliefs]] and [[individual]] predjudices often obscuring the facts.  
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(2) [[Recapitulation theory]]the [[theory]] formulated by E.H. Haeckel in which the [[individual]]s in their embryonic development pass through stages [[analogous]] in general structural plan to the [[stage]]s their [[species]] passed through in its [[evolution]]; the theory in which [[ontogeny]] is an abridged [[recapitulation]] of [[phylogeny]].
  
Francesco Redi, an Italian [[physician]], proved as [[early]] as 1668 that higher [[forms]] of [[life]] did not originate spontaneously, but proponents of [[abiogenesis]] claimed that this did not [[apply]] to microbes and [[continued]] to [[hold]] that these could [[arise]] spontaneously.  [[attempts]] to disprove the [[spontaneous generation]] of [[life]] from non-[[life]] [[continued]] in the [[early]] 1800s with [[observations]] and [[experiments]] by Franz Schulze and Theodor Schwann.
 
  
In 1864, [[louis]] [[pasteur]] [[finally]] announced the [[results]] of his [[scientific]] [[experiments]].  In a [[series]] of [[neat]] [[experiments]], [[pasteur]] demonstrated that [[life]] today did not [[arise]] in [[areas]] that had not been contaminated by existing [[life]].  Pasteur's [[empirical]] [[results]] were summarized in the [[phrase]], Omne vivum [[ex]] ovo, [[latin]] for "all [[life]] [is] from eggs".  thus [[dr]]. [[Louis]] [[pasteur]] [[finally]] overcame the longstanding [[belief]] in [[spontaneous generation]] of [[life]].
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'''Supplement'''
  
It is [[worth]] noting that [[louis]] Pasteur's [[research]] dealt with what can be observed to happen in the [[present]] [[day]] and says nothing about what may have happened on [[earth]] in the past. Indeed, both [[advocates]] of [[evolution]] and [[advocates]] of creationism both endorse [[abiogenesis]] as the [[means]] by which [[life]] began on [[earth]], the latter [[group]] simply claiming that [[god]] did it.  [[young]] [[earth]] creationists even go so [[far]] as to claim that fully grown creatures were created in their [[present]] [[form]] some six to ten thousand [[years]] ago, an [[idea]] which would seem to be completely discredited by Pasteur's [[research]].
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The [[theory]] has been discredited in time when modern [[science]] and [[genetics]] have raised doubt its [[validity]].
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''Synonyms:''
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*[[biogenetic law]]
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*[[Haeckel's theory]]
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*[[embryonic recapitulation]]
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*[[recapitulation theory]]

Latest revision as of 04:25, 10 January 2010

Definition

noun

(1) The principle stating that life arises from pre-existing life, not from nonliving material.

(2) Recapitulation theory: the theory formulated by E.H. Haeckel in which the individuals in their embryonic development pass through stages analogous in general structural plan to the stages their species passed through in its evolution; the theory in which ontogeny is an abridged recapitulation of phylogeny.


Supplement

The theory has been discredited in time when modern science and genetics have raised doubt its validity.

Synonyms: