heteromorphic


Also found in: Dictionary, Encyclopedia.

heteromorphic

(hĕt′ə-rō-môr′fĭk)
adj.
1. Having different forms at different periods of the life cycle, as in stages of insect metamorphosis.
2. Differing from the standard form in size or structure: heteromorphic chromosome pairs.

het′er·o·mor′phism n.

heteromorphic

  1. (of an organism) having morphologically different forms in the life history, for example, where there is ALTERNATION OF GENERATIONS.
  2. (of pairs of homologous chromosomes) differing in size or form.
Mentioned in ?
References in periodicals archive ?
lucii coincide with the heteromorphic pair in the region of a secondary constriction, confirming that this is the nucleolus organizer region.
For the 4 Plebeia species the heterochromatic arm of the heteromorphic pair was marked by [CMA.
They were identified as heteromorphic deutonymphs (hypopi) of Hypodectes propus (Nitzch, 1861).
Jauhar, 1969), and between Secale and Hordeum (Petersen, 1991) offer examples of instances where it is possible directly to recognize the parental origin of the chromosome during meiosis because of their size differences, allowing separation of homo- and heteromorphic bivalents.
In heteromorphic bivalents, in which a perfect equality in the length of the lateral components is achieved, length adjustments could result in a relocation of homologous loci along the synaptonemal complex, and crossing-over might be prevented in the adjusted segments (Holm & Wang, 1988).
Heteromorphic flower development in Neptunia pubescens, a mimosoid legume.
For example, the heteromorphic inflorescence in Neptunia pubescens (Leguminosae) produces three types of flowers.
If, in fact, one is going to attempt to invoke preexisting sporophytes (and gametophytes) in an algal lineage leading to embryophytes, a better guess (since land-plant sporophytes are virtually always different in appearance from gametophytes) would, perhaps, be that some type of green alga with distinctly heteromorphic alternation was ancestral.
Capitula homogamous or heterogamous, discoid, disciform, ligulate, or radiate, isomorphic or heteromorphic with dimorphic, sub-dimorphic, or rarely with trimorphic florets, with one to numerous florets; receptacle epaleate to paleate, glabrous, pilose, setose to fimbriate; involucre uniseriate to multiseriate.
This heteromorphic gametophyte potential must give a competitive
The sporophyte was derived from algae by the evolution of heteromorphic alternation of generations, in which the sporophyte became much enlarged relative to the gametophyte generation.
Distyly and variation in heteromorphic incompatibility in Gaertnera vaginata (Rubiaceae) endemic to La Reunion Island.