Science People...I have a question.

All six of my brothers seem to be a bit color blind (green/gray, especially), but neither my parents nor my sister and I are color blind (at least not in the standard sense--I do realize that everyone is technically "color blind"). The doctor who tested my oldest brother yesterday explained that he inherited the color blindness through my DAD and that it skips a generation.

Everything I have read on-line says that color blindness has to do with the X-chromosome, which has the genes for color vision on it. If that's true, then how would ALL six of my brothers have it and my mom not have it? It really wouldn't make any sense that way, but how can it be true that it has to do with the Y-chromosome if the genes for color vision are on the X-chromosome? Also, how would it skip a generation.

I really will post a real entry sometime. Life has been rather busy, and I have been extremely tired, so I really have not had the time to post and read entries as I would like. God bless each of you!