Sometimes we can see a kind of kid who behaves abnormal. The kid that I saw just sit there and threw things. Why does the kid look like this?
It is because when the mutation happened in the cell during mieosis, there is something wrong with chromosome number 21. As a result, the whole pair of chromosome number 21 go to one cell, and the other cell doesn’t get any. It causes the kid to have this disease—Down Syndrome.
Here is my presentation about Down syndrome