8 (14).ppt - The Basis of Heredity drag and drop pedigree it is a tool that is used To show the presence or absence of an inherited disorder among

8 (14).ppt - The Basis of Heredity drag and drop pedigree...

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The Basis of Heredity
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drag and drop pedigree
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it is a tool that is used: To show the presence or absence of an inherited disorder among family members To determine the mode of inheritance in genetic problems By genetic counsellors
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Generations are numbered using roman numerals Individuals are numbered using Arabic numbers
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1 2 3 4 5 6 7 8 9 10 1 2 I 1 2 3 4 5 6 II III Roman Numeral Arabic Numbers
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Symbols identify the gender of each individual and whether they had the trait
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Males are represented by squares Females are represented by circles
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Darkly coloured means the person is affected Half coloured means the person is heterozygous for an autosomal recessive
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1. Determine the mode of inheritance (E.g. autosomal dominant) 2. Determine the probability of an affected offspring for a given cross
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Are people whose parents are unknown Rules to follow: For dominant pedigrees: affected outsiders are assumed to be heterozygotes.
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  • Winter '17
  • John Travis
  • Genetics, Sex linkage, Phenylketonuria, X-linked dominant trait

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