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Probabilty is to predict the chance of something happening. So probabilties can be used in genetics to predict the chances of things.

For example, if to pea plants mate, one is short and the other is tall, then you could use a Punnett Square to predict what the children would look like. A Punnett Square predicts the possible combination of alleles.

So, in this case (T= tall/dominant and t= short/recessive), if you crossed TT with tt, the offspring would all be tall, or Tt.

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