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Chapter 11: Human Genetics

Practice Test
      
  1.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   heterozygote superiority  
  c.   homozygote inferiority  
  d.   color blindness  
  Hint    
      
  2.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   22nd  
  b.   X  
  c.   Y  
  d.   21st  
  Hint    
      
  3.What body systems does the disease cystic fibrosis affect?  
  a.   the endocrine and digestive systems  
  b.   the respiratory and digestive systems  
  c.   the circulatory and respiratory systems  
  d.   the circulatory and endocrine systems  
  Hint    
      
  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  
  Hint    
      
  5.Which of these disorders can NOT be identified through amniocentesis?  
  a.   Down syndrome  
  b.   sickle-cell anemia  
  c.   hemophilia  
  d.   Tay-Sachs  
  Hint    
      
  6.What is the disease in which blood does not clot normally?  
  a.   hemophilia  
  b.   cystic fibrosis  
  c.   sickle-cell anemia  
  d.   Huntington's disease  
  Hint    
      
  7.What body system does Huntington's disease affect?  
  a.   the nervous system  
  b.   the respiratory system  
  c.   the circulatory system  
  d.   the digestive system  
  Hint    
      
  8.The presence of three of one kind of chromosome is known as _________ .  
  a.   trisomy  
  b.   hemophilia  
  c.   karyotyping  
  d.   translocation  
  Hint    
      
  9.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   cystic fibrosis  
  b.   red-green color blindness  
  c.   sickle-cell anemia  
  d.   hemophilia  
  Hint    
      
  10.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   fetoscopy  
  b.   chorionic villus biopsy  
  c.   gene therapy  
  d.   amniocentesis  
  Hint    

 
   
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