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There are two main components, namely the onset and offset of a particular process, and the rate at which the process operates. Heterochrony, broadly defined, refers to evolutionary change in the rate or timing of development. The concept has long been central to evolutionary developmental biology and remains actively investigated; it has dominated the literature of evolutionary developmental biology. heterochrony—systematic change in the rate or timing of a developmental stage or event that occurs over successive generations (Gould, 1977)—as a mechanism that not only integrates developmental and evolutionary timescales into a unifying framework, but that also reveals bi-directional influences between the two processes.

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It is a key concept synthesizing development into ecology and evolution to explore the mechanisms of how developmental processes impact on phenotypic novelties. One primary mechanism by which phenotypic variants are known to arise is through changes in the timing or duration of organismal development resulting in alterations to adult morphology, a process known as heterochrony. Cause of Heterochrony Involves the dissociation of rates of maturation of gonadal tissue and that of somatic development - This allows changes to occur with respect to the rates of development of these two entities [gonads and somatic tissues] Three variables of Development het·e·ro·chron·y. (hĕt′ə-rō-krŏn′ē) n. A change or set of changes in the timing or duration of an organism's ontogenetic development compared with an ancestral species, resulting in morphological differences between ancestor and descendant.

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Heterochrony has been an important evolutionary mechanism for morphological differentiation of other groups of vertebrates as well. - Heterochrony produces changes significant enough to generate new taxa.

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A change or set of changes in the timing or duration of an organism's ontogenetic development compared with an ancestral species, resulting in Heterochrony is an enabling concept in evolution theory because it captures the image of dynamic biologic change diachronically across space and time. The term heterochrony (see Table 1 below) was first used by Haeckel in his explanation of the Biogenetic Law [ 1 ]. Ontogeny; isometric and allometric growth; heterochrony; paedomorphosis and peramorphosis 2000-01-04 · Heterochrony, the relative change of developmental timing, is one of the major modes of macroevolutionary change; it identifies temporally disassociated units of developmental evolution. Here, we report the results of a fine-scale temporal study for the expression of the developmental gene hairy and morphological development in three species of Drosophila , D. melanogaster , D. simulans , and Heterochrony has been invoked to explain differences in the morphology of modern humans as compared to other great apes. Melissa Tallman 2016, 'Shape Ontogeny of the Distal Femur in the Hominidae with Implications for the Evolution of Bipedality', PLOS ONE 10.1371/journal.pone.0148371.

Heterochrony. Särbegåvad eller ADHD? – Mona Liljedahl.
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Penetrating the  The molecular genealogy of sequential overlapping inversions img. img 6.

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Skull Development, Ossification Pattern, and Adult Shape in

Heterochrony and  Hemipenes in females of the Mexican viviparous lizard Barisia imbricata ( Squamata: Anguidae): an example of heterochrony in sexual development. Tracing  Heterochrony in the Act: The Migratory Politics of Time · Molding Resistance: Aesthetics and Politics in the Struggle of Bil'in against the Wall. I evolutionär utvecklingsbiologi , heterokroni är varje genetiskt reglerad skillnad i tidpunkt eller varaktigheten av en utvecklingsprocess i en  sequence heterochrony in xenarthran evolution,. Evolution and Development 13 (2011), 460-476. [5] Hautier, L. et al.: Skeletal development in sloths and the  A number of factors have long been considered to drive skull shape, including phylogeny, dietary preferences and functional constraints. However, heterochrony  Klingenberg, C. P. Heterochrony and allometry: The analysis of evolutionary change in ontogeny. Biol.