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Chapter 11: Human Genetics

Practice Test
      
  1.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 son who has hemophilia?  
  a.   0%  
  b.   50%  
  c.   100%  
  d.   25%  
  Hint    
      
  2.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.   color blindness  
  b.   influenza  
  c.   hemophilia  
  d.   malaria  
  Hint    
      
  3.Which of these diseases is caused by a dominant gene?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   Huntington's disease  
  d.   cystic fibrosis  
  Hint    
      
  4.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.   gene therapy  
  c.   genetic counseling  
  d.   genetic engineering  
  Hint    
      
  5.What is the disease in which blood does not clot normally?  
  a.   Huntington's disease  
  b.   sickle-cell anemia  
  c.   cystic fibrosis  
  d.   hemophilia  
  Hint    
      
  6.Which of these is NOT a normal treatment for people with sickle-cell anemia?  
  a.   blood transfusions  
  b.   drugs that increase oxygen-carrying capacity of blood cells  
  c.   antibiotics  
  d.   physical therapy  
  Hint    
      
  7.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.   50%  
  b.   100%  
  c.   25%  
  d.   0%  
  Hint    
      
  8.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   fetoscopy  
  b.   amniocentesis  
  c.   chorionic villus biopsy  
  d.   gene therapy  
  Hint    
      
  9.Which of these human disorders is the result of trisomy?  
  a.   Huntington's disease  
  b.   red-green color blindness  
  c.   hemophilia  
  d.   Down syndrome  
  Hint    
      
  10.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   22nd  
  b.   X  
  c.   Y  
  d.   21st  
  Hint    

 
   
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