Introduction to Medical Inheritance: Patterns in Families - BM5 RCR1

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1. Which of the following is an example of an X-linked disease?

  • Haemophilia B
  • Neurofibromatosis (type I)
  • Neurofibromatosis (type II)
  • Polycystic Kidney Disease
1 of 20

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2. Approximately how many recessive genetic diseases does the average person carry an allele for?

  • 1-5
  • 5-10
  • 20-30
  • 10-20

3. Which of the following is the most accurate definition for a dominant characteristic?

  • The characteristic manifests itself in the phenotype with both a homozygous and heterozygous genotype
  • The characteristic only manifests itself in the genotype with a heterozygous phenotype
  • The characteristic only manifests itself in the phenotype with a heterozygous genotype
  • The characteristic only manifests itself in the genotype with a homozygous genotype

4. Which of the following is the most accurate definition for a recessive characteristic?

  • The characteristic only manifests itself in the phenotype when the genotype is homozygous for those alleles
  • The characteristic only manifests itself in the genotype when the phenotype is heterozygous
  • The characteristic only manifests itself in the genotype when the phenotype is homozygous for those alleles
  • The characteristic only manifests itself in the phenotype when the genotype is heterozygous

5. An father unaffected by Myotonic Dystrophy and a mother with Myotonic Dystrophy type II (mild symptoms) have a child. Presuming that the mother is heterozygous, what is the chance of the child inheriting the disease?

  • 50%
  • 100%
  • 25%
  • 75%

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