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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Empirical probabilities.
To calculate the probabilities of compound events, you can use the multiplication rule or the addition rule, depending on whether the events are independent or mutually exclusive. The multiplication rule is used when the events are independent, and you multiply the probabilities of the individual events. The addition rule is used when the events are mutually exclusive, and you add the probabilities of the individual events.
probability is used in genetics to determine the possibilities of offspring having a certain trait