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A member asked:
I was wondering is down syndrome dominant or recessive?
A doctor has provided 1 answer
No autosomal: Down syndrome happens when an extra 21 chromosome is present in all the cells of the body. It happens before conception when the donor egg fails to shed one of its 21 chromosomes in the formation of the egg ; the male 21 joins the female pair ; creates an embryo with 3 number 21's. It has nothing to do with traits or mutations in the gene code.
Answered 1/7/2016
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