To solve your specific "mystery" chart, apply these rules to the individuals listed in the pedigree:
To help you update your own lab manual, here is a clean for the most likely questions: lab activity blood type pedigree mystery answer key upd
| | | $i$ (Mother) | | :--- | :---: | :---: | | $I^A$ (Father) | $I^Ai$ (Type A) | $I^Ai$ (Type A) | | $i$ (Father) | $ii$ (Type O) | $ii$ (Type O) | To solve your specific "mystery" chart, apply these
John has blood type A, which means his genotype can be either AA or AO. Since Mary has blood type O, her genotype must be OO. To solve your specific "mystery" chart
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