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Pedigree. Pedigree. “genetic” family tree. Male. Pedigree Symbols. Female. Pedigree Symbols. Mating between individuals. Pedigree Symbols. Mating between close relatives. Pedigree Symbols. Offspring “ line ”. Pedigree Symbols. Label generations (Roman Numerals ). Pedigree Symbols.
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Pedigree “genetic” family tree
Male Pedigree Symbols
Female Pedigree Symbols
Mating between individuals Pedigree Symbols
Mating between close relatives Pedigree Symbols
Offspring “line” Pedigree Symbols
Label generations (Roman Numerals) Pedigree Symbols I II
Label birth order (oldest youngest) Pedigree Symbols I 1 2 II 1 2 3
Identical Twins Pedigree Symbols
Nonidentical (Fraternal) Twins Pedigree Symbols
Offspring of unknown sex Pedigree Symbols
Aborted or stillborn Pedigree Symbols
Deceased Pedigree Symbols
Affected individual Pedigree Symbols
Heterozygous individual Pedigree Symbols
X-linked carrier (remember: only woman can be X-linked carriers) Pedigree Symbols
Drawing a pedigree Draw a pedigree that shows three children (one older brother and two younger sisters). The mother is older than the father. The mother’s father is older but the father’s mother is older. The eldest daughter, the father’s father (grandfather), and the mother are afflicted with a recessive disorder.
Drawing a pedigree I 1 2 3 4 II 1 2 III 1 2 3
Afflicted Males More afflicted men than women
Afflicted Males “Equal” Afflicted Men and Women AfflictedFemales
Autosomal Dominant Parent with Trait
Autosomal Recessive SkipsGeneration Parent can exhibit trait
Sex-linked X-linked Dominant XAXA XAXa XaXa XAY XaY XaXa X-linked Recessive XAXA XAXa XAY XaY
Describe this family Autosomal Recessive
Label the genotypesAutosomal recessive Aa Aa aa Aa ? ? Aa aa aa aa Aa aa
Describe this family Sex-linked Dominant
Label the genotypesSex-linked Dominant XAY ? XaY XAXa ? XAY XaXa XAXa XAXa XAXa XAXa XaY XaY XaY