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Genetics I. Introduction A. History 1. C. Darwin & A. Wallace blending 2. G. Mendel & F. Unger mixing 3. W. Sutton Chromosomal theory of Inheritance 4. T. Morgan Genes & Chromosomes plus linkage groups 5. A. Sturtevant genetic mapping 6. F. Griffith hereditary molecule
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7. O. Avery, etal. DNA hereditary molecule 8. B. McKlintock Transposons 9. W. Fiers sequenced viral gene 10. A. Jeffreys DNA finger printing 11. 1995 Viral DNA sequenced 12. 1996 yeast DNA sequenced 13. 1998 round worm DNA sequenced 14. 2003 human DNA sequenced
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a. Definition b. Terms i. Self vs. Cross Fertilization ii. Traits vs. Characteristics A. Experimental Design II. Mendelian 1. Monohybrid Cross
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Figure 14.2Figure 14.3 c. Process
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Figure 14.4 d. Principle: “Law of segregation” Figure 14.5
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i. Gene vs. Allele vs. Chromosome ii. Homozygous versus Heterozygous iii. Dominant versus Recessive iv. Genotype versus Phenotype e. Terms Figure 14.6
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f. Testcross Figure 14.7
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a. Definition b. Process i. Start by figuring out the parents genotypes Figure 14.8 2. Dihybrid Cross ii. Then how many and type of gametes
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Dihybrid Heterozygous cross = Phenotypic ratio= 9:3:3:1, Genotypic ratio= 1:1:2:2:4:2:2:1:1 Dihybrid Heterozygous cross Homozygous Dominant = Phenotypic ratio = all dominant, Genotypic ratio = 1:1:1:1 c. Principle: “Law of Independently Assortment” AaBb X AABB Gametes AaBb = AB, Ab, aB, & ab; AABB= AB only Practice AaBb X AaBb Gametes AaBb = AB, Ab, aB, & ab for both
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AA aa Aa 2. Co-dominance 1. Complete A. Dominance III. Variation on Mendel
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3. Incomplete dominance Figure 14.10
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1. Multiple Alleles B. Gene Interactions 2. Pleitrophy 3. Penetrance Figure 14.11
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1. Epistasis C. Beyond Mendel 2. Polygenic Figure 14.13
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Figure 14.9 1. R. Punnet & W. Bateson 1908 A. History IV. Classical Genetics
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a. Drosophila melangastor WHY? 2. T. Morgan Genes & Chromosomes, Karyotyping, plus linkage groups Figure 15.3
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Figure 15.4 b. Genetic Recombination Page 300
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Figure 15.10
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Figure 15.9 c. Genetic Linkage Page 300
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3. A. Sturtevant Genetic Mapping Based on frequency of expression of traits showing together Figure 15.10 Figure 15.11 Figure 15.12
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1. Sex Linked Inheritance B. Sex Linkage Figure 15.5 Figure 15.6 Figure 15.7
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2. Barr Bodies Figure 15.8
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1. Karyotyping 2. Amniocentesis Cellular and Chemical Analysis Figure 14.19 A. Techniques V. Detection of Problems
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3. Ultrasound 4. Chorionic Villi Sampling Cellular and Chemical Analysis Figure 14.19
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5. Fetal Tissue Sampling
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6. Pedigree Analysis Page 289
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