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Diagram illustrating nondisjunction during Meiosis I leading to trisomy after fertilization.

Diagram illustrating nondisjunction during Meiosis I leading to trisomy after fertilization.
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Draw a diagram to show how nondisjunction can occur during Meiosis I that results in Trisomy 21 after fertilization. Begin with a cell with 46 chromosomes (human). You only have to draw the homologous pair of chromosome 21, however you have to label the total number of chromosomes for each cell throughout the whole process. (There is an example on the next page for nondisjunction during Meiosis II) “Fertilize” the gametes produced after Meiosis II to show how Trisomy 21 would result See more

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