lecture 7 exam 2

lecture 7 exam 2 - Biology 313 Lecture 17 Oct 4, 2010...

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Unformatted text preview: Biology 313 Lecture 17 Oct 4, 2010 Practice Question Shell coiling of the snail Limnaea peregra results from a genetic maternal effect. An autosomal allele for a right-handed shell ( s+ ), called dextral, is dominant over the allele for a left-handed shell ( s ), called sinistral. A pet snail called Martha is sinistral. Which statement below is true? A) Martha's genotype must be ss. B) Martha's genotype cannot be s+s+ C) When Martha is crossed as a female, all of her offspring must be sinistral. D) When Martha is crossed as a female, at least some of her offspring must be sinistral. Chapter 6 : Human Heredity Reading: pp 134 - 146 Problems Concept Checks: 2-8 Worked Problem p. 141 Questions at end of Chapter: all starred 3 Techniques to Study Human Heredity 1. Pedigrees 2. Twin studies 3. Adoption studies Pedigree: pictorial representation of a family history, a family tree that outlines the inheritance of one or more characteristics Pedigrees You have to be a genetic sleuth Well focus on 5 modes of inheritance: Autosomal Recessive Traits Autosomal Dominant Traits X-linked Recessive Traits X-linked Dominant Traits Y-linked traits Pedigree Analysis Requires Recognizing Patterns Associated with Different Modes of Inheritance (based on Chapters 3-5) What is the mode of inheritance of the trait in this pedigree? What are the genotypes of the 16 individuals? If it were ethical, how could you test the genotype of IV-1 Contrast Autosomal Dominant Key: doesnt skip a generation; equal males and females are affected Well focus on 5 modes of inheritance:...
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This note was uploaded on 10/06/2011 for the course BIO 313 taught by Professor Rodermel during the Spring '11 term at Iowa State.

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lecture 7 exam 2 - Biology 313 Lecture 17 Oct 4, 2010...

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