Find a genotype from pedigree of autosomal dominant trait?

I don't think baldness (at least in this case) is genetic. If I were you, I would shade them. Also, the only way to predict (predict, not confirm) Chrissy's genotype would be to find the genotype of her siblings. If her sibling(s) both have AA (or Aa) genotype then so will she (because the probability of her having it will increase with increase in no. of siblings having similar genotype).

Okay, I did some browsing on this and what I have concluded is that, as I stated before, alopecia isn't purely genetic. It's influenced a lot by environment and life style of a person. Alopecia is very rare in women, so I can't help but make an analogy with haemophilia and hybrid cross in plants. I have to go with Aa on this one . Again that's just an educated guess, unless there's some other information available there's isn't anyway I can tell you Chrissy's genotype. Sorry
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