Pedigree charts

• Autosomal dominance

  Allele that causes disease is dominant

  2 parents with disease have a child without

  Male and female are equally likely to get disease

  Generally affected individuals in every generation
• autosomal recessive

  allele that causes disease is recessive

  skips generations

  2 parents without disease had a child with
• sex-linked recessive

  allele that causes disease is on the X chromosomes

  more common in males

  allele from mother
• sex linked dominant

  all daughters of a male who has the disease will also have disease

  no male to male transmission (father-son)