If a human zygote has either 45 or 47 chromosomes it might be assumed that this was due to nondisjunction.

Name: If a human zygote has either 45 or 47 chromosomes it might be assumed that this was due to nondisjunction.
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Nondisjunction is a genetic error that occurs during cell division, which can result in an abnormal number of chromosomes in the resulting cells. Therefore, if a human zygote has either 45 or 47 chromosomes, it indicates a possible nondisjunction event during fertilization.

If a Human Zygote Has Either 45 or 47 Chromosomes