Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

428Maggenti and Gardnerthe body; heterogonic or allometric growth. see bradyauxesis,isauxesis, tachyauxesis.heteroacanthus armature (PLATY: Cestoda) Hooks arrangedin semicircles from the internal surface to the externalsurface of the tentacles without chainettes. a. Atypica :differing numbers of hook rows on the internal and externalsurface of the tentacles. b. Typica : same number of hookrows, etc.heteroallelic a. [Gr. heteros, different; allelon, reciprocal]Genes having mutations at different mutational sites (nonidenticalalleles). see homoallelic.heteroausecic coefficient see allometric coefficientheteroblastic a. [Gr. heteros, different; blastos, bud] Similarorgans arising from different germ layers in different species.see homoblastic.heteroblastic change Rapidly altered structures during transitionfrom juvenile to adult.heterobrachial a. [Gr. heteros, different; brachion, arm]Chromosome arms of unequal length.heterocentric a. [Gr. heteros, different; kentron, midpoint]Dicentric chromosomes or chromatids whose centromeresare of unequal strength; frequently behave as monocentricchromosomes.heterochelate a. [Gr. heteros, different; chele, claw] (ARTHRO:Crustacea) Having the chelae of left and right chelipedsvarying in size and shape.heterochromatin n. [Gr. heteros, different; chroma, color]Non or poorly staining part of the chromosome inactive inheredity, as contrasted with euchromatin. heterchromatica.heterochrome a. [Gr. heteros, different; chroma, color] Havingdifferent colors. see homochrome.heterochromosome n. [Gr. heteros, different; chroma, color;soma, body] 1. Any chromosome differing from the autosomesin size, shape or behavior. 2. A sex-chromosome;an allosome.heterochronism n. [Gr. heteros, different; chronos, time]