Polydactyl

• Polydactyly


  Babies are born with extra fingers or toes
• Polydactyly


  • Most common form is caused by a dominant allele
  • Can be inherited from one parent who has the condition
  • People often have their extra digit removed
  • Some people live quite happily with them
• Heterozygous


  Having one dominant and one recessive allele
• Homozygous


  Having two dominant alleles
• Heterozygous for polydactyly


  Has a 50% chance of passing on the disorder to any child
• Homozygous for polydactyly


  Children will definitely have the condition
• Dominant genetic disorders


  Affect the way the body works more widely than polydactyly
• Dominant genetic disorders


  • Polydactyly
  • Huntington's disease
• Huntington's disease


  A dominant genetic disorder that affects the nervous system and eventually leads to death
• Parents


  • Father has polydactyly
  • Mother does not have polydactyly