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Chapter 9: The Origins of Chapter 9: The Origins of GeneticsGenetics
ProbabilityProbability
Likelihood that a specific event will Likelihood that a specific event will occuroccur
Can be expressed in words, Can be expressed in words, decimals, percentages, and fractionsdecimals, percentages, and fractions
Equation for probability:Equation for probability: Number of one kind of possible outcomeNumber of one kind of possible outcome
Total number of all Total number of all possible out comespossible out comes
ExamplesExamples
Mendel: The man, the Mendel: The man, the myth , the legendmyth , the legend
Why Use A Pea Plant?Why Use A Pea Plant?
Traits Are Expressed As Simple Traits Are Expressed As Simple RatiosRatios
Monohybrid crossesMonohybrid crosses
Experiments:Experiments:
What Did Mendel Observe?What Did Mendel Observe?
Law of Multiplication and Law Law of Multiplication and Law of Additionof Addition
Probability of a Specific Allele Probability of a Specific Allele in a Gametein a Gamete
Ex: A pea plant has two alleles for Ex: A pea plant has two alleles for seed color: one is for yellow and one seed color: one is for yellow and one is for greenis for green What is the probability that that the What is the probability that that the
gamete will carry the allele for green gamete will carry the allele for green seed color? Yellow seed color?seed color? Yellow seed color?