PierceGenetics6e_ch06_Blackboard.ppt

PierceGenetics6e_ch06_Blackboard.ppt - Benjamin A Pierce...

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GENETICS A Conceptual Approach SIXTH EDITION GENETICS A Conceptual Approach SIXTH EDITION Benjamin A. Pierce CHAPTER 6 Pedigree Analysis, Applications, and Genetic Testing © 2017 W. H. Freeman and Company
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6.1 The Study of Genetics in Humans Is Constrained by Special Features of Human Biology and Culture Special features: Controlled mating not possible Long generation time Small family size
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6.2 Geneticists Often Use Pedigrees to Study the Inheritance of Characteristics in Humans Pedigree: pictorial representation of a family history; a family tree that outlines the inheritance of one or more characteristics. Proband: the person from whom the pedigree is initiated
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Autosomal recessive traits: Fig. 6.4 Autosomal dominant traits: Fig. 6.5 X-linked recessive traits: Figs. 6.7 and 6.8 X-linked dominant traits: Fig. 6.9 Y-linked traits: Fig. 6.10 6.2 Geneticists Often Use Pedigrees to Study the Inheritance of Characteristics in Humans
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TABLE 6.1 Pedigree characteristics of autosomal recessive, autosomal dominant, X-linked recessive, X-linked dominant, and Y-linked traits Autosomal Recessive Trait 1. Usually appears in both sexes with equal frequency. 2. Tends to skip generations. 3. Affected offspring are usually born to unaffected parents. 4. When both parents are heterozygous, approximately onefourth of the offspring will be affected. 5. Appears more frequently among the children of consanguineous marriages.
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TABLE 6.1 Pedigree characteristics of autosomal recessive, autosomal dominant, X-linked recessive, X-linked dominant, and Y-linked traits Autosomal Dominant Trait 1. Usually appears in both sexes with equal frequency. 2. Both sexes transmit the trait to their offspring. 3. Does not skip generations. 4. Affected offspring must have an affected parent unless they possess a new mutation. 5. When one parent is affected (heterozygous) and the other parent is unaffected, approximately half of the offspring will be affected. 6. Unaffected parents do not transmit the trait.
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TABLE 6.1 Pedigree characteristics of autosomal recessive, autosomal dominant, X-linked recessive, X-linked dominant, and Y-linked traits X-Linked Recessive Trait 1. Usually more males than females are affected.
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