SME
Genetics · Problem type
Mode of inheritance from a pedigree
Use this for “Two unaffected parents have an affected daughter. Is the trait dominant, recessive or X-linked?”
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Which mode of inheritance fits the family?
Tap a card, then tap its group.
Look for the deciding clue: an affected child of unaffected parents, an unaffected child of two affected parents, or a carrier mother’s affected son.
Assumptions
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Each trait is fully penetrant: everyone with the genotype shows it.
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Squares are males and circles females; a filled symbol shows the trait.
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Half-filled symbols are carriers; where a card shows carriers, it shows all of them.
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