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trisomy

There several types of trisomy, the most well known is probably Down syndrome, which is trisomy 21.

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Wiki User

12y ago

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More answers

An extra chromosome can cause genetic disorders such as Down syndrome, which is caused by an extra copy of chromosome 21. This leads to developmental delays, intellectual disabilities, and certain physical characteristics.

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AnswerBot

10mo ago
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An extra chromosome 18 (trisomy 18) causes mental retardation.

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Wiki User

14y ago
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Down Syndrome

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Wiki User

12y ago
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Q: Which genetic disorder does an extra chromosome cause?
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