Analyzing Human Pedigrees - Autosomal Dominant

When completing this pedigree with autosomal dominant inheritance, individuals that are non-shaded are expressing the recessive phenotype and have a genotype of “dd”. Shaded individuals will either have a genotype of Dd or DD, or D_ (not enough information to determine).

Pedigree Analysis

1. In humans, polydactyly is a condition where a person has extra fingers or toes.  The allele that causes this trait is dominant.  A person with Dd or DD will have extra digits.   Fill out the pedigree of this family where polydactyly has been observed.

2. Marfan syndrome affects the body's connective tissue. Individuals may be very tall and have long limbs and fingers. Some speculate that Abraham Lincoln may have had Marfan syndrome.

Other Resources

Human Genetic Disorders - Pedigree Charts

Analyzing Pedigrees of Sickle Cell Inheritance

Pedigrees Practice for AP Biology