• Probability is the likelihood, or chance, that a certain event will occur.
  • When you toss a coin, the chance of a head turning up is 50 percent.
  • The more times you toss the coin, however, the closer you will get to 50 percent heads.
  • The same rules of probability in coin tossing apply to the main events that determine the genotypes of offspring.
  • These events are the formation of gametes during meiosis and the union of gametees during fertilization.
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