BIS 101 Notes 1-12-11

BIS 101 Notes 1-12-11 - B IS 101 Lecture 4 Chapter 3...

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BIS 101 1/12/11 Lecture 4 Chapter 3: Transmission Genetics I. Product Rule a. The likelihood of 2 simultaneous and independent events occurring is the multiplied product of each individual event i. Ex, ( ½ ) x ( ½ ) = ¼ II. Sum Rule a. The sum probability of adding 2 probabilities together. b. ( ½ ) + ( ¼ ) = ¾ III. Conditional Probability a. The probability of an event occurring that is contingent upon a certain additional circumstance or set of circumstances. i. Ex, if determining the proportion of yellow-seeded progeny from a monohybrid cross that have the same genotype as the parent, the conditional criterion is that only yellow-seeded progeny are considered. b. P1= TT x tt T=Tall t=short c. F1= Tt x Tt d. F2= T_ - ¾ i. ¼ = TT Conditional prob= 1/3 ii. ½ = Tt Conditional prob = 2/3 e. F2= tt – ¼ (eliminated because question is only considering tall plants) Cross M x F Frequency TT Tt tt
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TT x TT (1/3)(1/3)=1/9 1/9 - - TT x Tt (1/3)(2/3)=2/9 (1/2)x(2/9)=1/9 (1/2)x(2/9)=1/9
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BIS 101 Notes 1-12-11 - B IS 101 Lecture 4 Chapter 3...

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