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ProblemSet2

ProblemSet2 - BICD100 Prof Reinagel Fall 2005 Problem Set 2...

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BICD100 Prof. Reinagel Fall 2005 Problem Set 2 9/29/05 1. Mendel’s Second Law states that in a dihybrid cross, traits segregate independently. Prove that if Mendel’s Second Law is true, you will get a 9:3:3:1 segregation ratio for traits in a dihybrid cross. To “prove” you need to show where the numbers come from (for example, using a Punnet Square or a Tree Diagram or a Probability Equation). 2. In Mendel’s dihybrid cross (p.15 of his paper) he obtained the following data 315 round and yellow, 101 wrinkled and yellow, 108 round and green, 32 wrinkled and green. a) What is the observed ratio of the phenotypic classes? b) Perform a Chi Square test to determine the probability of getting data that deviated this much from the predicted ratios, if Mendel’s second law is true. Is the deviation statistically significant? What if Mendel had counted ten times as many seeds and obtained these data: 3150 round and yellow, 1010 wrinkled and yellow, 1080 round and green, 320 wrinkled and green.

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ProblemSet2 - BICD100 Prof Reinagel Fall 2005 Problem Set 2...

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