homeotic mutation

A mutation that causes a body part to develop in an inappropriate position in an organism, such as the mutation in Drosophila melanogaster that causes legs to develop on the head in place of antennae.

Glossary of Biotechnology for Food and Agriculture . 2015.

Look at other dictionaries:

  • Homeotic gene — Homeotic genes specify the anterior posterior axis and segment identity during early development of metazoan organisms. They are critical for the proper placement and number of embryonic segment structures (such as legs, antennae and eyes).The… …   Wikipedia

  • homeotic gene — Gene, containing homeobox, the level of expression of which is set during embryogenesis in response to positional cues, and which then directs the later formation of tissues and appendages appropriate to that part of the organism. Mutation of… …   Dictionary of molecular biology

  • Hox gene — Hox genes are a group of related genes that determine the basic structure and orientation of an organism.[1] Hox genes are critical for the proper placement of segment structures of animals during early embryonic development (e.g. legs, antennae …   Wikipedia

  • Drosophila embryogenesis — Drosophila embryogenesis, the process by which Drosophila (fruit fly) embryos form, is a favorite model system for geneticists and developmental biologists studying embryogenesis. The small size, short generation time, and large brood size make… …   Wikipedia

  • Homeobox — A short stretch of nucleotides (DNA or RNA) with an almost identical base sequence in all genes that contain that stretch. Homeoboxes occur in many organisms from fruit flies to human beings and appear to determine when particular groups of genes …   Medical dictionary

  • Macromutation — Most biologists believe that adaptation occurs through the accumulation of small changes, such as the slight differences between parents and their children, some of which can result from mutations. However, an alternative that has been suggested… …   Wikipedia

  • Hopeful Monster — is the colloquial term used in evolutionary biology to describe an event of instantaneous speciation, saltation, or systemic mutation, which contributes positively to the production of new major evolutionary groups. The memorable phrase was… …   Wikipedia

  • континуальная модель [хромосомы] — continuous model [of chromosome] континуальная модель [хромосомы]. Гипотеза, согласно которой хромосома в управлении развитием признаков действует как единое целое, а именно нарушение такой единой системы ведет к появлению гомеозисных мутаций… …   Молекулярная биология и генетика. Толковый словарь.

  • гомеозис — homeosis гомеозис. Pезкое изменение строения органа (придаточный Г.) или развитие нового органа на месте другого (замещающий Г.), обусловленное гомеозисной мутацией <homeotic mutation> (например, формирование ног вместо усиков Antennapedia… …   Молекулярная биология и генетика. Толковый словарь.

  • Notch — Notch. Cложный локус <complex locus> (включает по меньшей мере 4 группы комплементации), в котором известна серия гомеозисных мутаций <homeotic mutation>, представляющих собой перекрывающиеся делеции, локализован на Х хромосоме… …   Молекулярная биология и генетика. Толковый словарь.

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