Pedigree Analysis

Dominant rules

• every affected person has at least one affected parent

• two affected parents can have unaffected kids

Recessive rules

• two unaffected parents can have affected kids

• two affected parents cannot have unaffected kids

autosomal recessive

• affected daughter with unaffected father

• two unaffected parents have an effected daughter

• affected mom with unaffected son

dominant recessive

• Boys are usually affected

• affected boys have affected moms

• Affected daughters must have an affected father

autosomal dominant

• affected dad passes trait to a son

• affected dad with unaffected daughter

• affected son with unaffected mom

x linked dominant

• more affected women than men

• affected father has affected daughters

• all affected sons must have an affected mom