Charcot-Marie-Tooth is a muscular wasting disease that affects 1 in 2,500 people. Researchers have discovered that this occurs when a large gene on the short arm (p-arm) of chromosome number 17 makes a new copy of itself. What kind of chromosomal mutation is this? deletion
duplication
translocation
inversion

The correct answer is - duplication.

Explanation:

CMT or Charcot-Marie- Tooth is an inherited disease of muscular wasting that affects the arms and legs of an individual due to nerve damage mostly peripheral nerves that leads to smaller and weak muscles. This inherited disease is found to be due to the mutation that takes place on chromosome 17.

The mutation is duplication type due to fact that the short arm of chromosome number 17 takes place and copy the new copy of p-arm or short arm.

Thus, the correct answer is - duplication.

that is true   : ) hope this you

your spelling is a little off : ]