Post by skyship on Jul 9, 2009 2:36:00 GMT -5
Peritheca is the result of forming and attaching that creates
a fruiting body.
This fimicola does just that. Takes a Natural Scientist to tell us.
note pictures here and how they form.
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Genetic variability is further increased by a process called crossing over. In the early stages of meiosis, the homologous pairs of chromosomes move close together in such a way that all four chromatids are entwined, forming a tetrad. This process, known as synapsis, allows for the exchange of chromosome sections between the homologous pairs.
The example that will be used in the investigation is Sordaria fimicola. S. fimicola is an ascomycete fungus that is haploid for the bulk of its life cycle; the haploids comprise the individual fungal filaments, called hyphae, which normally exist in a mass called a mycelium representing the “body” of the fungus, and the ascospores, from which mycelia develop. The only diploid portion of the life cycle of S. fimicola occurs when the nuclei of specialized hyphae come together.
These hyphae, which belong to different strains of the species, fuse to form a zygote. This zygote then undergoes meiosis to produce the haploid ascospores, yielding four haploid nuclei contained in a sac called an ascus. After meiosis, the four nuclei undergo mitosis, resulting in an ascus containing eight haploid ascospores. Many asci form inside a fruiting body called a perithecium (Figure 1).
.....
tinyurl.com/nb9k8q
resources.wardsci.com/resources-and-tips/
sordaria-genetics-background/
These ascospores though carry the hybrid asciis.
So more on ascospores later
Symbiosis and tetrads.
Tetrahedron has been mentioned. The 3 dimensional gene?
mmmmm
en.wikipedia.org/wiki/Tetrahedron
skyship
a fruiting body.
This fimicola does just that. Takes a Natural Scientist to tell us.
note pictures here and how they form.
=======================
Genetic variability is further increased by a process called crossing over. In the early stages of meiosis, the homologous pairs of chromosomes move close together in such a way that all four chromatids are entwined, forming a tetrad. This process, known as synapsis, allows for the exchange of chromosome sections between the homologous pairs.
The example that will be used in the investigation is Sordaria fimicola. S. fimicola is an ascomycete fungus that is haploid for the bulk of its life cycle; the haploids comprise the individual fungal filaments, called hyphae, which normally exist in a mass called a mycelium representing the “body” of the fungus, and the ascospores, from which mycelia develop. The only diploid portion of the life cycle of S. fimicola occurs when the nuclei of specialized hyphae come together.
These hyphae, which belong to different strains of the species, fuse to form a zygote. This zygote then undergoes meiosis to produce the haploid ascospores, yielding four haploid nuclei contained in a sac called an ascus. After meiosis, the four nuclei undergo mitosis, resulting in an ascus containing eight haploid ascospores. Many asci form inside a fruiting body called a perithecium (Figure 1).
.....
tinyurl.com/nb9k8q
resources.wardsci.com/resources-and-tips/
sordaria-genetics-background/
These ascospores though carry the hybrid asciis.
So more on ascospores later
Symbiosis and tetrads.
Tetrahedron has been mentioned. The 3 dimensional gene?
mmmmm
en.wikipedia.org/wiki/Tetrahedron
skyship