Chromosome defect: Ds is one of the more common chromosome(c) defects that can survive pregnancy (many others miscarry).Eggs are supposed to have a single 21c & combine with the 21 from dads normal sperm.In ds the pair of moms 21c +dad's 21 creates a baby with the three 21c in all tissues.This extra material confuses the creation of body parts causing ds..Various prenatal tests can pick up signs early on.
Answered 3/9/2020
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Down syndrome : Down's syndrome (also known as Down syndrome) is a genetic chromosome problem. Someone with Down's syndrome has an extra copy of chromosome 21 in the cells of their body. This happens due to error when sperm or ovum are dividing.
Answered 9/20/2017
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