There are many way that the two karyotypes are extremely different. One is that, in the HeLa cells there are different numbers of chromotids compared to the normal cell. Ann Fischer of USCF, UCLA and UC Berkeley even states that "[HeLa cells] have the strangest karyotype. They have 3 copies of this, and two copies of that and 5 copies of that. They're not normal." At the bottom of the picture of the HeLa karyotype are different pieces of chromosomes being compressed together, there isn't a place where the jumbled chromosomes can be settled. These karyotypes were probably caused by the impaired assortment of the chromosomes during meiosis.
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