07 airing about redheads no longer existing in a coupl

Question:

Where can I find the 1/14/07 airing about redheads no longer existing in a couple generations?

The researcher was from Ireland. Seems redheads are a regressive trait & the man claims they will gradually die out--meaning fewer & fewer people will be born with red hair. I'm really not sure what category this would be in; science? humanity?

Best Answer - Chosen by Asker: I think this is more of a genetics question rather than a genealogy question. So maybe ask this question to a scientific community, you may receive a better answer.