Day 16: Is Down syndrome hereditary?

Down Syndrome Awareness Month - Day 16

Is Down syndrome hereditary?

The only type of Down syndrome that's hereditary (passed through genes from parent to child) is translocation Down syndrome. Of all cases of Translocation Down syndrome, approximately one third (equal to 1% of all cases of Down syndrome) are hereditary.

Unrelated picture but I'm really missing Armenia right now so I'm throwing a picture of Etchmiadzin Cathedral.