Family trees/Family pedigrees

Cards (24)

  • What are family trees sometimes called?
    Family pedigrees
  • What type of disorder is cystic fibrosis?
    Recessive inherited disorder
  • How many cystic fibrosis alleles are needed to have the disease?
    Two cystic fibrosis alleles
  • How are cystic fibrosis alleles represented?
    Lowercase f
  • How is the healthy version of the cystic fibrosis allele represented?
    Capital F
  • What genotype indicates a person has cystic fibrosis?
    Homozygous recessive genotype
  • What genotype indicates a carrier of cystic fibrosis?
    Heterozygous genotype
  • What does a half-shaded shape represent in a family pedigree?
    Carrier of the condition
  • What do circles and squares represent in a family pedigree?
    Circles for females, squares for males
  • What does a shaded shape indicate in a family pedigree?
    Person has the condition
  • How can you determine the genotype of each person in a pedigree?
    By using the diagram and key
  • What does each new row in a family tree represent?
    A new generation
  • What does a horizontal line connecting two shapes indicate?
    They are a couple
  • What is the genotype of Paul, who is a carrier?
    Capital F lowercase f
  • What genotypes do Anna and Lucy have?
    Heterozygous genotype
  • What genotypes do Ron and Harry have?
    Homozygous dominant genotype
  • What is the genotype of Sam's wife?
    Lowercase f lowercase f
  • What is the chance of Lucy and Jack's baby having cystic fibrosis?
    1 in 4 or 25%
  • What genotypes do Lucy and Jack have?
    Both are heterozygous
  • How do you set up a Punnett square for Lucy and Jack?
    Lucy's alleles on the left, Jack's on top
  • What does the Punnett square help determine?
    Probability of genotypes in offspring
  • What is the genotype of a completely unaffected person?
    Homozygous dominant genotype
  • What are the key components of a family pedigree?
    • Circles represent females
    • Squares represent males
    • Shaded shapes indicate affected individuals
    • Half-shaded shapes indicate carriers
    • A key explains symbols
  • How do you analyze a family tree for cystic fibrosis?
    1. Identify genotypes of individuals
    2. Determine carriers and affected individuals
    3. Use a Punnett square for offspring probabilities
    4. Understand relationships and generations