Progenesis


Progenesis

Progenesis is a mechanism in developmental biology that is associated with paedomorphosis. Progenesis refers to the attainment of sexual maturity by an organism still in its larval or juvenile stage and a secondary result of never experiencing later developmental stages. Organisms that are progenetic never achieve the adult form experienced by their evolutionary ancestors.

Mechanisms of progenesis

Progenesis is sometimes induced by environmental conditions that inhibit the completion of metamorphosis, such as low temperature or lack of available iodine leading to low thyroid gland activity. The larval form may mature sexually, mate, and produce fully viable offspring. If environmental conditions improve, this particular kind of progenesis can sometimes be reversed, with the larvae completing metamorphosis and attaining normal maturity.

Animal Kingdom

This biological state is found in certain amphibians and also among insects.

Paedogenesis

Progenetic organisms are capable of paedogenesis. This is the act of reproducing while in the larval form and occurs in the females of certain beetles, Strepsiptera, bagworms, and gall midges.

See also

* paedomorphosis
* neoteny
* paedogenesis
* heterochrony


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  • ProGenesis — ist ein Zusammenschluss von Christen aus verschiedenen Kirchen, Freikirchen und Berufen. Der Verein ProGenesis wurde am 27. Oktober 2001 in der Schweiz gegründet. Ende 2005 hatte er rund 480 Mitglieder. Sein Ziel ist die Darstellung der… …   Deutsch Wikipedia

  • progenesis — progenesis. См. прогенез. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Progenesis — Progenese („Vorentwicklung“) ist ein Vorgang der Heterochronie. Bei der Progenese kommt es zu einer evolutionären Vorverlegung der Geschlechtsreife im Verlauf der Individualentwicklung (Ontogenie) eines Tieres, die im Gegensatz zur Neotenie zum… …   Deutsch Wikipedia

  • progenesis — n. [Gr. pro, before; genesis, origin] 1. Retention of juvenile characters by precocious, sexually mature morphologically juvenile stage; see paedogenesis. 2. (PLATYHELMINTHES: Trematoda) Larval reproduction …   Dictionary of invertebrate zoology

  • progenesis — pro·gen·e·sis jen ə səs n, pl e·ses .sēz precocious sexual reproduction in a trematode worm in which metacercariae or sometimes cercariae may lay eggs capable of repeating the life cycle pro·ge·net·ic jə net ik adj …   Medical dictionary

  • progenesis — pro·genesis …   English syllables

  • progenesis — (ˈ)prō+ noun Etymology: New Latin, from pro (I) + genesis : precocious sexual reproduction in a trematode worm in which metacercariae or sometimes cercariae may lay eggs capable of repeating the life cycle compare neoteny, paedogenesis …   Useful english dictionary

  • прогенез — progenesis прогенез. Процесс созревания половых клеток до достижения организмом взрослого состояния; в частности, П. всегда сопровождает неотению <neoteny>. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А.,… …   Молекулярная биология и генетика. Толковый словарь.

  • Ontogeny and Phylogeny (book) — Ontogeny and Phylogeny is Stephen Jay Gould s first technical book, published in 1977 by Belknap, a division of Harvard University Press. Gould wrote that Ernst Mayr suggested in passing that he write the book, but that I only began it as a… …   Wikipedia

  • Coitocaecum parvum — Scientific classification Kingdom: Animalia Phylum: Platyhelminthes Class: Trematod …   Wikipedia


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