Pedigrees 2024

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What is a pedigree?

Back

A pedigree is a diagram that shows the occurrence and appearance or phenotype of a particular gene or organism and its ancestors, often used to track inheritance patterns.

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What does AUTOSOMAL DOMINANT mean?

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Autosomal dominant refers to a mode of inheritance where only one copy of a dominant allele is needed for an individual to express the trait.

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What is the genotype of an unaffected individual for an AUTOSOMAL DOMINANT trait?

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The genotype of an unaffected individual is 'aa'.

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What is the genotype of an affected individual for an AUTOSOMAL DOMINANT trait?

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The genotype of an affected individual can be either 'AA' or 'Aa'.

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What does AUTOSOMAL RECESSIVE mean?

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Autosomal recessive refers to a mode of inheritance where two copies of a recessive allele are needed for an individual to express the trait.

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What is the genotype of an affected individual for an AUTOSOMAL RECESSIVE trait?

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The genotype of an affected individual is 'aa'.

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What is the mode of inheritance for Huntington's Disease?

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Huntington's Disease is inherited in an autosomal dominant manner.

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What does a filled symbol represent in a pedigree?

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A filled symbol represents an affected individual.

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What does an empty circle represent in a pedigree?

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An empty circle represents a not affected female.

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What does an empty square represent in a pedigree?

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An empty square represents a not affected male.