If Tracy has a blood type of AB and Trevor is also AB, then their children may have AA, BB or AB genotypes.
What is a Punnett square?
A Punnett square is a diagram to represent the possible gametic combinations that will produce one or more genotypes in offspring.
In this case, the Punnett square is:
      A     B
A Â Â Â Â AA Â Â Â AB
B Â Â Â Â AB Â Â Â BB
In consequence, the children may have as genotypes the AA (25%), BB (25%), or AB (50%) genotypes.
Learn more about Punnett square here:
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