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Other Genetic Principles
December 6, 2019: What if some mutation occurs to the Xist gene and X inactivation does not occur? Have any such cases been reported?
October 22, 2019: Is vision genetic? I have a friend who has awful vision but both of her parents are fine. Could this have something to do with genetics?
July 2, 2004:
How did I get green eyes? I understand that blue is recessive and that in theory all children of two blue-eye parents should have blue eyes. But, what about green? My parents are blue-eyed and have 2 green-eyed children and 1 blue-eyed child. And yes, he is my father. My high school Bio teacher embarrassed me by announcing to the entire class that he couldn't be when we studied eye color. So, how did I end up with green eyes? Thanks!
Is there any possible way for two blue-eyed parents to have a green or brown-eyed child?
Is it possible for a green-eyed person and a blue-eyed person to have a brown-eyed child?
One day my father's first cousin and I were discussing our Swedish background. This led to discussion of eye color. She said, "You know, both my mother and father had blue eyes." I looked into her eyes and they were dark brown! I thought I knew enough genetics to know that blue + blue yields ONLY blue eyes. I called my father that night (a physician) and he said he had never thought about it, but now that I mentioned it, my great-grandparents used to tell the story that her mother had thought she had been given the wrong baby at the hospital in Chicago (1927) Her sister had blonde hair and blue eyes and used to tease her about being adopted (she wasn't). She had bright red hair and brown eyes. She must have been the wrong baby!? Can blue eyes + blue eyes = brown eyes? I would never tell her what I suspect, but I am curious for my own sake. I suspect that in downtown Chicago in 1927, she was actually an "O'Brien" instead of a Peterson.