Topic: Are Men Dying Off?
I listened to an Art Bell archived progam last night (from May 2, 2004, I believe). The guest was Dr. Bryan Sykes from Oxford's genetics department who published a book last year called "Adam's Curse" that offers the idea that men might be becoming extinct.
Apparently, over the past thousands of years, the Y chromosome has been degenerating, and only carries about one tenth of its original complement of genes. The X chromosome has been thriving.
I'm no genetic whiz, but the problem is due in part to the fact that the Y chromosome doesn't "recombine," and so is prone to mutations. Sykes described the Y chromosome as a "genetic mess."
I looked around the net and not all researchers share Sykes' grim outlook for the Y chromosome, but they seem to agree that the Y chromosome is indeed degenerating and looks like it will continue to degenerate.
I also found that there are mammals who reproduce without Y chromosomes. Both sexes have X chromosomes, but there are certain genes activated in some that cause maleness.
I also found that the same is being found to be true with humans. It isn't the Y chromosome per se that determines maleness, but a set of genes on it that activate other genes that begin the male differentiation. Though, that gene (I believe) resides on the Y chromosome. However, there have been males born double X with just a tiny Y--that critical part of the Y that caused male sexual characteristics.
My schema of genetics is being redefined. What if the Y chromosome did disappear, but "sexes" continued to be? Is what we know as the Y chromosome actually the result of ancient genetic tampering? What if men and women were originally XX, but one of the X chromosomes was mutilated/mutated to produce, say, ultraviolent men?
but you can avoid its teeth.