Another name for down payment?

It is also known as trisomy 21 (trisomy= 3 copies of one of the chromosomes, the 21 just describes which chromosome has the trisomy).

Well Down Syndrome is sometimes called Up Syndrome because most kids with Down Syndrome are very happy. Trisomy 21

The down ref is also known as the second referee.

Composing is another word for writing music.

Another name for Down syndrome is trisomy 21