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Dictionary » C » Chromosome ChromosomeDefinition noun, plural: chromosomes A structure within the cell that bears the genetic material as a threadlike linear strand of DNA bonded to various proteins in the nucleus of eukaryotic cells, or as a circular strand of DNA (or RNA in some viruses) in the cytoplasm of prokaryotes and in the mitochondrion and chloroplast of certain eukaryotes.
In eukaryotes, the chromosomes appear as threadlike strand that condense into thicker structures and aligns on the metaphase plate during mitosis. Humans normally have 23 pairs of chromosomes, each with a characteristic length and banding pattern. Chromosomes occur in pairs (in most somatic cells) since one member of each pair comes from the mother and the other from the father. In most prokaryotes, the chromosome is usually a circular strand of DNA; hence, the entire genome is carried on only one chromosome. In viruses, the chromosome may appear as short linear or circular structure containing the DNA or RNA molecule often lacking any structural proteins.
Related forms: chromosomal (adjective).
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Results from our forumStructure of ChromosomesDoes each chromosome in a human cell contain one complete DNA molecule, so that there are 46 separate DNA molecules, one for each chromosome? Or does a single DNA molecule continue as an extended filament, running in and out of ...
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living forever... to repare the accumulated damages, hence death. The molecule you are speaking with is called telomere and actually represent the ends of the chromosome in the cell. But remember that evolution acts on individula, not on the species. If you had genes that could allow to profit of your own ...
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Re: Natural selection is proven wrong... in some insects, fishes, amphibians, reptiles and rat.[18] Paleopolyploidy is the scientific study of prehistoric polyploid speciation events. Chromosome Speciation (fast - Human, Fruit Fly, Mosquito) Chromosome fusion speciation[17] is the result of two chromosomes joining to become a single ...
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How does Head To Head Telomere Fusion express itself?... to pull by way of letting tubulin go from the pole end: thus pulling on the centromeres as they shorten. Are they strong enough to pull a fused chromosome apart? Depends on how condensed the chromosome at the fused part in order for it to either break off and freely go with the rest of the chromosome, ...
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Can a turtle and a frog breed?... be very small. There are multiple resons for this starting from simple phsyiological and behavioral differences to more complex elements such as chromosome numbers and genetics. One could perhaps get something done by genetic engineering, but even making a true hybrid (half the genome from frog ...
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