3. (4 pt.) Think about the nondisjunction you modeled with the orange- and green-tipped chromosomes. What can you say about the origin of two X chromosomes for ND at meiosis I vs. ND at meiosis II. Are the two X chromosomes in each case former sister chromatids or former are they from former homologous chromosomes? Explain why. No points will be earned without an accompanying explanation a. In meiosis I ND? b. In meiosis l ND?
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