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Chapter 11: Human Genetics

Practice Test
  1.What is the disease in which blood does not clot normally?  
  a.   hemophilia  
  b.   cystic fibrosis  
  c.   Huntington's disease  
  d.   sickle-cell anemia  
  2.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   fetoscopy  
  b.   ultrasonography  
  c.   genetic counseling  
  d.   gene therapy  
  3.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   two  
  b.   four  
  c.   one  
  d.   three  
  4.What two kinds of ions are involved in cystic fibrosis?  
  a.   sodium and sulfur ions  
  b.   iron and hydrogen ions  
  c.   sodium and chloride ions  
  d.   chloride and iron ions  
  5.What is the most commonly inherited disease among white people?  
  a.   cystic fibrosis  
  b.   sickle-cell anemia  
  c.   Huntington's disease  
  d.   hemophilia  
  6.If a normal father and a mother who is a carrier of the allele for hemophilia have children, what is the probability that they will have a daughter who has hemophilia?  
  a.   0%  
  b.   100%  
  c.   50%  
  d.   25%  
  7.What process do prospective parents go through when they want to be sure any future child will be free of genetic defects?  
  a.   marriage counseling  
  b.   genetic engineering  
  c.   gene therapy  
  d.   genetic counseling  
  8.Cystic fibrosis is inherited when a child receives a recessive allele from each parent. What is the probability that parents who are both heterozygous for cystic fibrosis will have a child with this disease?  
  a.   75%  
  b.   50%  
  c.   25%  
  d.   100%  
  9.A person who is heterozygous for sickle-cell anemia has a condition known as sickle-cell trait. What disease does sickle-cell trait protect a person against?  
  a.   malaria  
  b.   hemophilia  
  c.   color blindness  
  d.   influenza  
  10.Which of these is NOT a normal treatment for people with sickle-cell anemia?  
  a.   antibiotics  
  b.   blood transfusions  
  c.   physical therapy  
  d.   drugs that increase oxygen-carrying capacity of blood cells  

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