heterogenesisn.
/ˌhɛtərəʊˈdʒɛnɪsɪs/ Biology.† 1. Abnormal or irregular organic development: see quot. 1854. Obsolete. (So French hétérogénésie.)† 2. Applied to sexual reproduction from two different germs, male and female. Obsolete.
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1854 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Heterogenesis, name given by Breschet to a Class of organic deviations comprehending those in which there exists a relative anomaly, whether from the situation or from the colour of organs, the number or the situation of the fetuses belonging to the same gestation, the situation or the number of organs in particular.
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1858 E. Lankester & W. B. Carpenter Veg. Physiol. (new ed.) §398 The process by which new individuals are produced is called Heterogenesis. In this process, two different cells are concerned..germ-cells and sperm-cells.
3.
a. The birth or origination of a living being otherwise than from a parent of the same kind.
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the world > life > biology > biological processes > genetic activity > heredity or hereditary descent > [noun] > production unlike parents
heterogenesis1864
xenogenesis1870
1864 Q. Jrnl. Sc. Jan. 17 Heterogenesis is a term employed to express the creation or birth of living beings in an abnormal manner.
1864 Q. Jrnl. Sc. Jan. 17 At present the evidence which we possess..is rather adverse to the doctrine of ‘heterogenesis’ in any form.
1870 Huxley in Brit. Assoc. Rep. p. lxxvii The living parent was supposed to give rise to offspring which passed through a totally different series of states from those exhibited by the parent, and did not return into the cycle of the parent; this is what ought to be called Heterogenesis, the offspring being altogether, and permanently, unlike the parent.
b. esp. The generation of animals or vegetables of low organization from inorganic matter; abiogenesis; spontaneous generation.
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1878 Tyndall in 19th Cent. III. 23 The notion of heterogenesis or spontaneous generation.
c. Alternation of generations.
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the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [noun] > alternate generation
alternate generation1841
alternation of generations1845
metagenesis1849
heterogenesis1863
heterogamy1884
heterogeny1886
heterogony1906
1863 H. Spencer Princ. Biol. I. ii. vii. 211 Where propagation is carried on by heterogenesis, or is characterized by unlikeness of the successive generations, there is always asexual genesis with occasionally-recurring sexual genesis.
1875 tr. E. O. Schmidt Doctr. Descent & Darwinism 169 When the species is composed of a regular alternation of variously constituted generations and individuals. This particular sort of reversion is termed Alternate Generation, or Heterogenesis.
This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2018).
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n.1854