Top Business Officer: Executive Vice PresidentâBusiness Operations for the Office of the President, Vice Chancellor for Administration, or the position responsible for the locationâs financial reporting and payroll as designated by the Executive Officer. III.
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.
Failure of chromosomes to separate correctly in mitosis or meiosis is called nondisjunction. Should nondisjunction occur in the first meiotic division, homologous chromosomes remain paired resulting in two daughter cells with an extra set of chromosomes and two daughter cells with no chromosomes. Nondisjunction may also occur in meiosis II when sister chromatids fail to separate prior to cell division.