Question: how many chromosome sets does a tetraploid organism (4n) has?
Answer: Organisms that have more or less than the normal number of sets are aberrant euploids. Polyploids are individual organisms in which there are more than two chromosome sets. They can be represented by 3n (triploid), 4n (tetraploid), 5n (pentaploid), 6n (hexaploid), and so forth.