gbaji wrote:
I've also seen some totally bizzare (and seemingly impossibly unlikely) twists of genetics. For example: The male contributes an X or X, and the female an X or Y. Since XX is male and XY female, then the logical conclusion is that the gender of the child is soley determined by random chance from the mother, right? Yet, I know a family where there is literally an unbroken line of males going back about 6 generations. Every male child has had nothing but male children. And not just one or two. At least 3 or 4 children in each family. The odds are staggeringly unlikely, but it's so far held true. Heck. I knew one of the sons, after he'd mentioned this anomaly about his family to me, and watched as he and his wife proceeded to have 3 sons over the next 5 years or so. The Mormon Church loves these guys btw...
Two things:
First, males contribute an X or a Y, while females contribute only an X. The situation is reversed in insects (excepts moths & butterflies, for some reason).
Second, the odds for the family pattern you describe are no different from any other pattern. Think of it as a lottery. While the odds of a particular person winning the lottery are vanishingly small, the odds of
someone winning are quite high.
I know, it seems counterintuitive, but it's true.