Yes, this is an absolutely fascinating thread! I wonder if I have a BO that is a gynandromorph. I think the uniform coloration of the BOs might make gynandromorphy less obvious. I bought her as a day-old chick from a local breeder. She grew faster than the other chicks I got with her and for a while, we suspected that she would be a rooster. She ended up being a hen, but was the last to lay of my six hens. She's also very beastly big, being at least 50% heavier than my next heaviest hen (CM) and nearly double the weight of her actual BO sister. After laying intermittently for a month, she stopped. Eventually she molted and now at 13 months of age, she's laying intermittently again. Between the laying bouts she grew a large spur--nearly an inch long--on her right foot. The spur on her left foot is a tiny button-nub. I also think I see shape asymmetries from left to right. She's otherwise a delightful chicken.
Here are a couple interesting articles on gynandromorph chickens, the first is easier to understand, the second is a bit more detailed for those wanting to understand the underlying mechanisms.
http://news.nationalgeographic.com/news/2010/03/100315-half-male-half-female-chickens/
http://news.sciencemag.org/sciencenow/2010/03/no-sexual-confusion-for-chicken.html
Here are a couple interesting articles on gynandromorph chickens, the first is easier to understand, the second is a bit more detailed for those wanting to understand the underlying mechanisms.
http://news.nationalgeographic.com/news/2010/03/100315-half-male-half-female-chickens/
http://news.sciencemag.org/sciencenow/2010/03/no-sexual-confusion-for-chicken.html