Well, no. Iceland just is more resolute in aborting tainted fetuses than most countries. There is no data that the incidence or prevalence of Down is diminishing in Iceland. There is, as yet, no evidence determining a cause. Down isn't inherited, as recessive characteristics are. It's not race based. It is idiopathic.
Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21.
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