Lecture8.BioSci97 - Mendelian Genetics II Advanced Concepts...

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1 Mendelian Genetics II: Advanced Concepts Lecture 8 Bio Sci 97 (B & C) Fall 2009
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2 Hourly Results Section B Mean = 10.7 SD = 3.2 Section C Mean = 11 SD = 3.3 Rough unofficial grading scale 14 to 19 = A-, A 11 to 13 = B-, B, B+ 8 to 10 = C-, C, C+ 5 to 7 = D-, D, D+
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3 Sample Problem (Lecture 7) 7. George, Gregor Mendel’s friend and next-door neighbor, tries to repeat Mendel’s experiments. He obtains a true-breeding line of the wrinkled pea plants, but his line of round pea plants is not true-breeding. Some of his round pea plants when self-crossed give rise to wrinkled pea plants. He crosses a large number of his round pea plants with a large number of his wrinkled pea plants. Which genotype(s) would he expect to see in the F 1 progeny assuming that only one locus is determining this trait? (Remember that round is the dominant trait and that the alleles for this trait are denoted by W and w ). (A) WW only (B) Ww only (C) WW mainly and a few Ww (D) Ww mainly and a few WW (E) Ww mainly and a few ww
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4 Definitions (Classical and Molecular) Gene = hereditary determinant of trait, Allele = different forms of a gene, Genotype = genetic constitution = which alleles of a gene does an organism have, Phenotype = observable properties,
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5 “Gamete Box” Do not confuse with Punnett Square! What are the gamete genotypes produced from a given parental genotype? For example: Aa Bb Alleles of First Gene Alleles of Second Gene A ½ Gamete Genotypes in Box ¼ AB a ½ B ½ b ½ ¼ ab ¼ aB ¼ Ab
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6 Outline Lecture 8 Pedigrees
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