Definitions for Heterochrony
het·e·rochrony

WiktionaryRate this definition:0.0 / 0 votes

1. heterochronynoun

   the variation in ontogeny of individuals of a species that gives rise to evolution

WikipediaRate this definition:0.0 / 0 votes

1. Heterochrony

   In evolutionary developmental biology, heterochrony is any genetically controlled difference in the timing, rate, or duration of a developmental process in an organism compared to its ancestors or other organisms. This leads to changes in the size, shape, characteristics and even presence of certain organs and features. It is contrasted with heterotopy, a change in spatial positioning of some process in the embryo, which can also create morphological innovation. Heterochrony can be divided into intraspecific heterochrony, variation within a species, and interspecific heterochrony, phylogenetic variation, i.e. variation of a descendant species with respect to an ancestral species. These changes all affect the start, end, rate or time span of a particular developmental process. The concept of heterochrony was introduced by Ernst Haeckel in 1875 and given its modern sense by Gavin de Beer in 1930.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Heterochronynoun

   in evolution, a deviation from the typical sequence in the formation of organs or parts

2. Etymology: [Gr. of different times; other + time.]

WikidataRate this definition:0.0 / 0 votes

1. Heterochrony

   In biology, heterochrony is defined as a developmental change in the timing of events, leading to changes in size and shape. There are two main components, namely the onset and offset of a particular process, and the rate at which the process operates. A developmental process in one species can only be described as heterochronic in relation to the same process in another species, considered the basal or ancestral state, which operates with different onset and/or offset times, and/or at different rates. The concept was first introduced by Ernst Haeckel in 1875. An example can best illustrate the three dimensions of heterochrony. ⁕If a developmental process, such as the growth of a tail in the embryo of "species A", starts earlier and ends earlier than that of "species B", but the rate of growth is the same for both, the final result may basically be the same, although the tail of species A develops earlier than the one of species B. The earlier exhibits predisplacement, and the later species exhibits postdisplacement. ⁕If the rate of growth is increased, and the time between the start and end of development is decreased proportionally, the tail will end up the same size. The species with faster growth exhibits acceleration, and the species with slower exhibits neoteny.

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Heterochrony

   het-e-rok′ro-ni, n. (biol.) a divergence in ontogenetic sequence affecting the time of formation of parts or organs—also Heterochrō′nia.—adj. Heterochron′ic.—n. Heteroch′ronism.—adjs. Heterochronist′ic; Heteroch′ronous.

EntomologyRate this definition:0.0 / 0 votes

1. Heterochrony

   an irregular development in point of time, a later stage becoming evident before one that is earlier in ordinary course.

How to pronounce Heterochrony?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say Heterochrony in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of Heterochrony in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of Heterochrony in Pythagorean Numerology is: 1

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Heterochrony
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Heterochrony
3. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/Heterochrony
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=Heterochrony
5. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=Heterochrony
6. ^ Entomology
   https://www.gutenberg.org/files/22748/22748-h/22748-h.htm#:~:text=Heterochrony