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Answers. Best Answer: Primary nondisjunction can happen during meiosis when the chromosomes fail to separate as they should. This produces gametes with more than or less than the usual number of chromosomes. Secondary nondisjunction happens during meiosis in an individual whose chromosomes are already the wrong number because of nondisjunction. So, primary nondisjunction could produce a gamete with two Xs and a zygote with XXY. When this person matures and produces gametes, secondary nondisj.
Best Answer: You must be referring here to the phenomenon of non-disjunction that occasionally takes place during meiosis. Under normal conditions, meiosis proceeds in 2 parts: Meiosis1: Double stranded homologous chromosomes separate, giving rise to 2 haploid cells with duplicate chromosomes. Meiosis 2: The 2 chromatids then separate, giving rise to another 2 cells. Occasionally, non-disjunction occurs.