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  • https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/07%3A_Cell_Division/7.04%3A_Polyploidy
    This page discusses polyploidy, the condition of having more than two sets of chromosomes, mainly observed in plants like wheat and sugar cane. It can occur naturally through errors in gamete formatio...This page discusses polyploidy, the condition of having more than two sets of chromosomes, mainly observed in plants like wheat and sugar cane. It can occur naturally through errors in gamete formation or be induced artificially. Polyploidy can lead to speciation, with hybrids often sterile while polyploid plants remain fertile. Although rare in animals, some instances, such as a tetraploid rat, have been recorded.
  • https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Principles_of_Biology/02%3A_Chapter_2/14%3A_Mutations/14.07%3A_Changes_in_Numbers_of_Genes_or_Chromosomes
    A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells. “Tri-” is Greek for “three”; people with trisomy have three copies of a particular chromosome in cells instead ...A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells. “Tri-” is Greek for “three”; people with trisomy have three copies of a particular chromosome in cells instead of the normal two copies. Monosomy, or the loss of one chromosome in cells, is another kind of aneuploidy. “Mono-” is Greek for “one”; people with monosomy have one copy of a particular chromosome in cells instead of the normal two copies.

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