Definition of homeosis in English:


Syllabification: ho·me·o·sis
Pronunciation: /ˌhōmēˈōsis

noun (plural homeoses /-ˌsēz/)

  • The replacement of part of one segment of an insect or other segmented animal by a structure characteristic of a different segment, especially through mutation.
    More example sentences
    • Genes identified by such mutations are called homeotic genes because when mutated they result in homeosis - the transformation of a whole segment or structure into another related one, as in the transformation of antenna to leg.
    • This research on homeosis was intended to support both his view of genetic structure and his view of evolution.
    • However, those experiments show only what morphological changes are possible to manipulate experimentally, not what actually happened in evolution, and one question is why homeosis would occur at all.



Pronunciation: /-ˈätik/
More example sentences
  • The evolution of homeotic mutants, according to Simpson, still depended on selection acting on populations of individuals.
  • Thus major changes in body plan are possible over very short time intervals when homeotic, regulatory genes are involved.
  • For example, it is becoming clear that co-option has played a critical role in evolution and the homeotic genes are not exempt in this regard.


late 19th century: from Greek homoiōsis 'becoming like', from homoios 'like'.

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