Board Thread:General Grimm Discussion/@comment-78.72.160.162-20150328122307/@comment-26368233-20151205173507

The genetics of the show do not follow real life genetics. In the episode with the "bigfoot" Juliette looked at the "bigfoot" genetics and found it was a chimera--a combination of 2 different species. The only thing (at least that I remember) that they said was different about grimms is they have extra rods in the eyes (to be able to see wesen).

Even if the show followed real world genetics it would be hard to predict who would be a grimm. It could be it takes more than one dominate gene for the grimm. It also could be a recessive gene, or a series of recessive genes. Or a combination of both.

As for Josh--we don't know at this point. I thought either Kelly or Marie said they had a brother who was not a grimm. It could be Josh will not be a grimm, or as stated by other posters he may be a grimm but has not started seeing wesen but will as he gets older.

As the show has not given the origin of wesen or grimms it is hard to say how many grimms there could be or if everyone non-wesen has a part of the grimm gene. I personally would like some of the back story on the origination of both. It seems that, at least in Portland, almost everyone Nick meets is wesen.