unit 2 lect 14 - Lecture 14 Reading: Topics: Biol 002...

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Lecture 14 Biol 002 2-19-07 Reading: Chapter 13: 252-260, 262-264 Topics: Mendel's second law and probability theory. Beyond the simplicity of Mendel's genotype-phenotype relationships Human genetics, part 1 I. Review the terms of genetics introduced in the last lecture and in the reading for it including what is meant by the law of segregation note that the law itself is almost trivial after studying meiosis however, in describing it, we use terms that are very instructive about how genetics works II. Mendel's law of Independent Assortment: (p. 253-254) What does independent assortment mean? What happens and why? Exemplified with a dihybrid cross: (fig. 13.15) F1 X F1, in which the F1 is heterozygous for each of two characters (i.e., dihybrids) (It's important to know the overall result, but, more important, is to know why this result occurs.) The key is that the alleles assort independently to give four equally probable gamete genotypes: RY, Ry, rY, ry III. Probability and Mendelian genetics
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unit 2 lect 14 - Lecture 14 Reading: Topics: Biol 002...

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