Step 1: Is it dominant? Doesn't skip generations! Or recessive? Skips generations.
Step 3: Is it Autosomal or Sex-linked? If it is a 50/50 ratio between men and women the disorder is autosomal.
Step 4: Is it X linked? Unaffected mother has affected sons then it it X linked. Or Y linked? Affected father has affected sons then it is Y linked.
* Women are XX. **Remember that women can carry a recessive X linked trait without showing any signs. This only happens if they have a dominant gene on their second X.
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