Pedigrees, or the creation of family trees, are often used in the genetic research of humans, especially in the research of genetically determined diseases. They play a particularly important role, as humans have very long generations (approximately 17-22 years) and very few offspring.
Standard symbols are used in the creation of pedigrees so that they can be easily understood.
Pedigrees can indicate if the condition is autosomal or sex-linked and whether it is dominant or recessive.
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| This pedigree considers attached earlobes (or the recessive phenotype) to be the condition being studied, so the homozygous recessive individuals are the coloured symbols. |
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| A pedigree for an unknown X-linked dominant condition |
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A pedigree for Y-linked inheritance
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