Bio82 Section Week 1 2017 Key.pdf

Bio82 Section Week 1 2017 Key.pdf - 1 Week 1 Section...

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1 Week 1 Section: Application of Mendelian Rules of Inheritance KEY The goal here is to reinforce the ways we link phenotype to genotype. In this section, we will focus on genetic models so you can practice how you would set up and analyze crosses to deduce genotypes from phenotypes. Relevant Skills: Apply Mendel’s two key rules of inheritance (Law of Segregation and Law of Independent assortment) and extensions to these two laws, to interpret phenotypic data from genetic crosses and deduce possible modes of inheritance (i.e., dominance relationships between alleles and the number of genes) governing different traits. Define a pure-breeding strain. Learn how and when to apply test-crosses to get information about genotypes. Exercise 1: Weasel Coat color Many mammals exhibit variations in coat color. For example, weasels can be either black, grey, tan, beige or white. The following table gives the results of crosses between individual pairs of male and female weasels. From this table, come up with the simplest hypothesis as to how many genes are involved in the specification of coat color, the alleles involved and their dominance relationships to each other. father mother progeny 1. black X grey all black C b C b C g C g C b C g 2. black X black 77 black: 24 tan C b C t C b C t C b C b , C b C t C t C t 3. tan X white all beige C t C t C w C w C t C w 4. beige X beige 23 tan: 52 beige: 25 white C t C w C t C w C t C t C t C w C W C w 5. grey X grey 78 grey: 22 tan C g C t C g C t C g C g C g C t C t C t
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