chapter 6

chapter 6 - Dhruv Patel Chapter 6: Pedigree Analysis,...

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Dhruv Patel Chapter 6: Pedigree Analysis, Applications, and Genetic Testing 1. Pedigree a. a pictoral representation of a family history b. It looks for patterns indicative of various modes of inheritance 2. Symbols used in a pedigree 3. Autosomal Recessive Traits a. Normally appear with equal frequencies In both sexes b. Can only appear when a person inherits two alleles from the trait c. Seems to skip generations d. Affected offspring usually born to unaffected parents e. When both parents are carriers: ¼ th of the offspring will have it f. Consanguinity increases frequency of recessive alleles
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4. Autosomal Dominant Trait a. Appears in both sexes with equal frequencies b. Both sexes transmit the trait to their offspring c. Does not skip generations d. Affected offspring must have affected parents e. Unaffected parents do not transmit the trait f. Traits do not go away and reappear g. Incomplete penetrance can affect the characteristics i. Ex Polydactyly: the allele for polydactyly is dominant but it is incompletely penetrant in heterozygotes
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5. X-linked Recessive Trait
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chapter 6 - Dhruv Patel Chapter 6: Pedigree Analysis,...

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