heterochrony

American  

[het-uh-rok-ruh-nee] / ˌhɛt əˈrɒk rə ni /

noun

Biology.

1. a genetic shift in timing of the development of a tissue or anatomical part, or in the onset of a physiological process, relative to an ancestor.

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heterochrony Scientific  

/ hĕt′ə-rō-krŏn′ē /

1. A change 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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Other Word Forms

• heterochronic adjective
• heterochronistic adjective
• heterochronous adjective

Etymology

Origin of heterochrony

1875–80; hetero- + chron- + -y ³; compare German Heterochron

Example Sentences

Complex heterochrony underlies the evolution of Caenorhabditis elegans hermaphrodite sex allocation.

From Nature

The different ways some parts of us seem to accelerate and mature while others bide their time or halt altogether has generated a flock of terms related to neoteny—paedomorphosis, heterochrony, progenesis, hypermorphosis, and recapitulation.

From Scientific American

Evolution of craniofacial novelty in parrots through developmental modularity and heterochrony.

From Scientific American

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

From Project Gutenberg