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Heteromorphosis (/ ˌhɛt.ə.rəʊˈmɔrf.ə.sɪs /, / ˌhɛt.rə.-/) (Greek: έτερος – other; morphe – form) refers to situations where an organ or tissue is different from the expected, [1] either because of (embryonic) development anomalies, or after reparative regeneration following a trauma. [2]
The morph phenotype is genetically linked to genes responsible for a unique system of self-incompatibility, termed heteromorphic self-incompatibility, that is, the pollen from a flower on one morph cannot fertilize another flower of the same morph. Heterostylous plants having two flower morphs are termed "distylous".
Land plants all have heteromorphic (anisomorphic) alternation of generations, in which the sporophyte and gametophyte are distinctly different. All bryophytes, i.e. liverworts, mosses and hornworts, have the gametophyte generation as the most conspicuous. As an illustration, consider a monoicous moss.
A distinct SI mechanism exists in heterostylous flowers, termed heteromorphic self-incompatibility. This mechanism is probably not evolutionarily related to the more familiar mechanisms, which are differentially defined as homomorphic self-incompatibility .
In biology, polymorphism is the ... The system is called heteromorphic self-incompatibility, and the general 'strategy' of stamens separated from pistils is known as ...
Distyly is a type of heterostyly in which a plant demonstrates reciprocal herkogamy.This breeding system is characterized by two separate flower morphs, where individual plants produce flowers that either have long styles and short stamens (L-morph flowers), or that have short styles and long stamens (S-morph flowers). [1]
The non-fertilising morph(s) have no function, and are simply developmental errors. This is thought to be unlikely in many sperm heteromorphic species because the production of infertile sperm may be highly regulated, and infertile sperm can make up >90% of the total sperm in some Lepidoptera and Drosophila.
This is made possible through heteromorphic sex chromosomes expressed as XY. [1] [2] Silene recently evolved sex chromosomes 5-10 million years ago and are widely used by geneticists and biologists to study the mechanisms of sex determination since they are one of only 39 species across 14 families of angiosperm that possess sex-determining ...