A member asked:

Can a pedigree help you determine if a disease is autosomal dominant or x-linked dominant?

A doctor has provided 1 answer

Not always: X-linked dominant diseases are distinctly rare. One might notice that dads never pass the disease to their sons and always pass it to their daughters, and in a large enough pedigree the pattern might become clear. Also remember that new mutations occur, non-paternity can occur, people may not know they're adopted, and cases can be missed.

Answered 1/1/2016

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