No one has ever found ploidy or seen its effects in marijuana - its touted here because of the idea it can produce super plants which it does so in melons and pumpkins hence the massive world record varieties.
Wiki
https://en.m.wikipedia.org/wiki/Polyploidy
says just an extra set of chromosomes and gives you a good read but note it says not all plant species.
Hemp yes cannabis no but cannabis has very complex genetics so no one knows for surecwhat it does in some areas like its sex genetics.
If you actually had a ploidy plant you might find you have some ultra rare situation and would instantly be paid millions for them - obviously a gazillion growers and not one documented scientific polyploid.
I can but ramble - in reality its myth stuff just ignore it till the scientific community make a global anouncement and freely share the genetic map for it, stoners smoke too much and embelish weed like its a magic plant that can do everything.
Hope that helps and gives you some confidence to read more on wiki and other plant species ploidy and how they made super plants - all very interesting