How to Solve an Unknown Pedigree Trait Identify whether the trait is __________ Once you’ve determined if the trait is dominant or recessive, fill out the pedigree as if it’s an X-linked version of that trait and look for discrepancies. For example, if it doesn’t make sense for a child to be affected based on the parents info or vice versa, that’s a discrepancy, meaning it couldn’t possibly be X-linked, so instead it must be Autosomal. If there are no discrepancies, that it is X-linked.