| 释义 |
Definition of heteromorphic in English: heteromorphicadjective ˌhɛt(ə)rə(ʊ)ˈmɔːfɪkˌhɛdərəˈmɔrfɪk Biology Occurring in two or more different forms, especially at different stages in the life cycle. 〔生〕（尤指在生活周期的不同阶段）异形的，异态的 Example sentencesExamples - The evolution of the heteromorphic sex chromosomes from an indistinguishable pair of autosomes is triggered by the suppression of recombination.
- In organisms in which gender is based on one sex being homomorphic and the other heteromorphic for the sex chromosomes, a process has evolved to equalize the output of products encoded by the genes located there.
- The hermaphroditic and gynodioecious species, S. conica, and S. vulgaris, which are related to the dioecious species, do not have heteromorphic chromosomes.
- However, to understand the current structure of sex determination in Drosophila, it is necessary to consider its evolution from an ancestral state, prior to the evolution of heteromorphic sex chromosomes and dosage compensation.
- Silene latifolia is a dioecious plant with heteromorphic sex chromosomes.
Derivativesnoun Biology Most heteromorphs form a U-shaped chamber, whereas many normally coiled ammonites inflate or enlarge the terminal body chamber and constrict the aperture. Example sentencesExamples - Most heteromorph ammonites have a hooked terminal body chamber.
- In the stages A - 3 to AI heteromorphs can be distinguished from tecnomorphs by slightly broader velum in the anteroventral region.
- The presence of occasional preadult heteromorphs was mentioned also by Schallreuter, Jones and Meidla.
- Size dimorphism, in which the heteromorphs are slightly larger than the tecnomorphs, can be recognized in late instars.
- Ancyloceratina, which contains all other Mesozoic heteromorphs, evolved from Perisphictidae during the Tithonian.
noun Biology Based on this extensive background information, the identification of molecular genetic markers for the Primula S-locus was undertaken as the first step towards characterization of the genes that control heteromorphy in this plant. Example sentencesExamples - A more recent hypothesis proposes that floral heteromorphy, via approach herkogamy, precedes the acquisition of SI.
- Variations in chromosome patterns during in vitro maintenance were rapid and discrete, involving loss of heteromorphy or appearance of additional chromosome size variants.
- There is abundant evidence for the repeated evolution of sex chromosomes and sex chromosome heteromorphy, followed by phenomena such as dosage compensation and imprinting.
- The molecular mechanisms underlying heteromorphy have remained largely elusive, and most of what is known to date about self-incompatibility has been uncovered through studies on homomorphic systems.
Definition of heteromorphic in US English: heteromorphicadjectiveˌhedərəˈmôrfikˌhɛdərəˈmɔrfɪk Biology Occurring in two or more different forms, especially at different stages in the life cycle. 〔生〕（尤指在生活周期的不同阶段）异形的，异态的 Example sentencesExamples - Silene latifolia is a dioecious plant with heteromorphic sex chromosomes.
- The hermaphroditic and gynodioecious species, S. conica, and S. vulgaris, which are related to the dioecious species, do not have heteromorphic chromosomes.
- In organisms in which gender is based on one sex being homomorphic and the other heteromorphic for the sex chromosomes, a process has evolved to equalize the output of products encoded by the genes located there.
- The evolution of the heteromorphic sex chromosomes from an indistinguishable pair of autosomes is triggered by the suppression of recombination.
- However, to understand the current structure of sex determination in Drosophila, it is necessary to consider its evolution from an ancestral state, prior to the evolution of heteromorphic sex chromosomes and dosage compensation.
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