Introduction to Genetic Analysis 144

Introduction to Genetic Analysis 144 - 143 Problems 24....

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Unformatted text preview: 143 Problems 24. What is the formula for interference? How are the expected frequencies calculated in the coefficient of coincidence formula? 25. Why does part c of the problem say if appropriate? 26. How much work is it to obtain such a large progeny size in corn? Which of the three genes would take the most work to score? Approximately how many progeny are represented by one corn cob? 11. You have a Drosophila line that is homozygous for autosomal recessive alleles a , b , and c , linked in that order. You cross females of this line with males ho- mozygous for the corresponding wild-type alleles. You then cross the F 1 heterozygous males with their heterozygous sisters. You obtain the following F 2 phenotypes (where letters denote recessive pheno- types and pluses denote wild-type phenotypes): 1364 1 1 1 , 365 a b c, 87 a b 1 , 84 1 1 c, 47 a 1 1 , 44 1 b c, 5 a 1 c , and 4 1 b 1 ....
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