Lecture 11 SRR F-2011

Lecture 11 SRR F-2011 - Biology 313 Lecture 11 Sept 19,...

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Biology 313 Lecture 11 Sept 19, 2011 The immutans variegation mutant of Arabidopsis, defective in a carotenoid biosynthesis gene
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Chapter 5: Modifications and Extensions of Basic Principles PROBLEMS : --Concept Checks: 1-8 --Worked Problems: 1, 2, problem on p.112 --Comprehension/ Application questions --Answers at end of text: 1-5, 14, 15, 18, 24, 25, 26, 29, 31 --Answers on Blackboard under “Assignments”: 16, 20
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1. Allelic interactions: Phenotypes can be determined by special characteristics of the alleles of a gene (interactions between products of R versus r) 1. Gene interactions: Phenotypes can be determined by interactions between different genes (interactions between products of genes A and B), called “gene interaction Chapter 5: Extending Mendel-- how is phenotype determined?
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1. Allelic Interactions: Phenotypes can be determined by special characteristics of the alleles of a gene (interactions between products of R versus r) 2. Gene interactions: A. “Principles to guide you” Chapter 5: Extending Mendel-- how is phenotype determined?
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Principles to help you 1. Most of the time, we will examine gene interactions using dihybrid crosses, where we are given the genotype or the phenotype of the P or F1. If you are given only the phenotype, ALWAYS start the cross with true breeding (homozygous) parents e.g., AAbb x aaBB 2. The F1 will nearly ALWAYS be heterozygous for the two traits – e.g., AaBb
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Principles to help you 3. The F2 is usually derived by selfing (or intercrossing) the F1, and this will generate progeny that most ALWAYS fit a modified 9:3:3:1 Mendelian ratio – e.g., a 9:7 ratio, a 12:3:1 ratio
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Lecture 11 SRR F-2011 - Biology 313 Lecture 11 Sept 19,...

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