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    Genetics in Human Cells

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    What may cause human cells to contain 45 or 47 chromosomes instead of 46and what is Down syndrome?

    © BrainMass Inc. brainmass.com October 9, 2019, 5:08 pm ad1c9bdddf

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    The most common cause of aneuploidies (more or less than the appropriate chromosome number and type) is nondisjunction during meiosis. Nondisjunction means that a chromosome pair failed to separate during the meiotic division. This will create one daughter cell with an extra chromosome and another daughter cell with one too few chromosomes. If the nondisjunction occurs during the first meiotic division ...

    Solution Summary

    The expert determines what may cause human cells to contain 45 to 47 chromosomes instead of 46. What is Down syndrome is determined.