A 54-year-old member asked:
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is down's syndrome a recessive condition?

1 doctor answer
Dr. Anna-Kaisa Niemi
15 years experience Clinical Genetics
No: Down syndrome is not a recessive condition. It is caused by an extra chromosome #21. We normally have a pair (=two copies) of each chromosomes #1-22. Individuals with Down syndrome have a third chromosome #21. Thus name "trisomy 21" as well. Here more about mechanism and heritability of Down syndrome if you are interested: http://ghr.Nlm.Nih.Gov/condition/down-syndrome.
Answered on Sep 28, 2017
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