Genetic Example

• Segregation probabilities of progeny from an F1 cross

  P(RR) = 1/4
  
  P(Rr) = 1/2
  P(rr) = 1/4

• RR & Rr are dominant, what is probability of obtaining either RR or Rr. Use sum rule:

  P(RR or Rr) = P(RR) + P(Rr)
  
  =1/4 + 1/2
  =3/4

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