Biology / Unit 5 Bio 1025 worked example, 60 to 90 seconds
Applying the Probability Rules to a Genetic Cross
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The idea
This procedure applies the addition and multiplication rules together to predict a two-outcome offspring probability without building a full Punnett square.
Where people slip
The rule of addition and the rule of multiplication answer different questions — using addition where events must jointly occur, or multiplication where they are alternatives, gives the wrong probability.
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