Nondisjunction Diagrams
1. Meiosis I 2. Meiosis II 3. Fertilization 4. Zygote The left image at the blue arrow is nondisjunction taking place during meiosis II. The right image at the green arrow is nondisjunction taking place during meiosis I. Nondisjunction is when chromosomes fail to separate normally resulting in a gain or loss of chromosomes. This can happen during mitosis or meiosis. Primary nondisjunction occurs during meiosis I and the result is both members of a homologous pair go into the same daughter cell. This has the eggs have one more or one less number of chromosomes. Once the sperm fertilizes the egg then there is an abnormal number of chromosomes. Secondary nondisjunction happens during meiosis II and this results when the sister chromatids fail to separate, ending up with both daughter chro...
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