Question

Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a genetic disorder that is also called trisomy 21. What would trisomy 21 look like in a karyotype?

Answer 1

"tri" means three

normally there are only two copies of each chromosome, but in trisomy 21 there are three copies of chromosome 21

therefore you would expect three copies of chromosome 21 where every other chromosome set only has two each