What type of mutation causes down syndrome? (point, frameshift, deletion, insertion, etc.) -- Why is it categorized as this type of mutation?​

Trisomy 21: About 95% of people with Down syndrome have Trisomy 21. With this type of Down syndrome, each cell in the body has 3 separate copies of chromosome 21 instead of the usual 2 copies. Translocation Down syndrome: This type accounts for a small percentage of people with Down syndrome (about 3%).

cdc

answer; convade;