An expecting mother underwent a fetal blood test to determine if her unborn child has a genetic disorder. The results from the test indicated that the fetus has 3 chromosomes 21. No other individual within this family has this genetic anomality. Explain how this happened

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Chapter9: Patterns Of Inheritance
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  1. An expecting mother underwent a fetal blood test to determine if her unborn child has a genetic disorder. The results from the test indicated that the fetus has 3 chromosomes 21. No other individual within this family has this genetic anomality. Explain how this happened. 
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