nondisjunction-ans

nondisjunction-ans - Worksheet on non-disjunction: (a) Fill...

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(a) Fill in the cells below showing the NORMAL process of meiosis of the male’s sex chromosomes (XY – the X and Y are representing the entire chromosome, and remember X and Y act like a homologous pair). For the X chromsome in a duplicated state I would use (XX) to show it is duplicated). DO NOT show crossing over. ½ of the gametes will have the X chromsome and ½ of the gametes will have a Y chromosome. Remember we are only showing the sex chromosomes, and there would be 22 other chromosomes in each of the gametes. (b) Fill in the cells below showing the process of meiosis of the male’s sex chromosomes with non- disjunction occurring during meiosis I . DO NOT show crossing over. prior to meiosis X Y prior to meiosis X Y (xx) (yy) (XX) (YY) X X Y Y (xx) (yy) Duplication of DNA (xx) (yy) X Y X Y homologous pairs split sister chromatids split homologous pair does not split normally the X and Y chromosomes stay together with the first split – they are
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nondisjunction-ans - Worksheet on non-disjunction: (a) Fill...

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