Introduction to Genetic Analysis 71

Introduction to Genetic Analysis 71 - 44200_02_p27-72...

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70 Chapter 2 Patterns of Inheritance 45. Red hair runs in families, and the accompanying illustration shows a large pedigree for red hair. (Pedigree from W. R. Singleton and B. Ellis, Journal of Heredity 55, 1964, 261.) a. Does the inheritance pattern in this pedigree sug- gest that red hair could be caused by a dominant or a recessive allele of a gene that is inherited in a sim- ple Mendelian manner? b. Do you think that the red-hair allele is common or rare in the population as a whole? 46. When many families were tested for the ability to taste the chemical PTC, the matings were grouped into three types and the progeny totaled, with the results shown below: about doing this? Show not only which crosses to make, but also how many progeny should be sam- pled in each case. 48. We have dealt mainly with only two genes, but the same principles hold for more than two genes. Con- sider the following cross: A / a ; B / b ; C / c ; D / d ; E / e ± a / a ; B / b ; c / c ; D / d ; e / e a. What proportion of progeny will phenotypically
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