Downs is not genetic.
Get your facts straight, firebrand!
Downs is genetic! It's also called "Trisomy 21" - because the 21st chromosome pair (of the 23 pairs every normal human has) is present, not as a pair, but as a triplet.
It is not, however, inherited. (I.e., the parents are usually genetically normal.)
Regards,
????? It’s entirely genetic. It’s an extra chromosome (#21).
Extra chromosome.
It certainly is!