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Chapter 11: Human Genetics

Practice Test
      
  1.What body system does Huntington's disease affect?  
  a.   the nervous system  
  b.   the circulatory system  
  c.   the respiratory system  
  d.   the digestive system  
  Hint    
      
  2.What is the process in which cells from a tissue inside the womb are removed and grown to provide a karyotype of the fetus?  
  a.   amniocentesis  
  b.   chorionic villus biopsy  
  c.   gene therapy  
  d.   genetic counseling  
  Hint    
      
  3.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.   25%  
  c.   100%  
  d.   0%  
  Hint    
      
  4.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   fetoscopy  
  b.   gene therapy  
  c.   ultrasonography  
  d.   genetic counseling  
  Hint    
      
  5.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   color blindness  
  c.   heterozygote superiority  
  d.   homozygote inferiority  
  Hint    
      
  6.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.   color blindness  
  c.   influenza  
  d.   hemophilia  
  Hint    
      
  7.What is the most commonly inherited disease among black people?  
  a.   hemophilia  
  b.   cystic fibrosis  
  c.   sickle-cell anemia  
  d.   Huntington's disease  
  Hint    
      
  8.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.   100%  
  c.   50%  
  d.   25%  
  Hint    
      
  9.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   X  
  b.   21st  
  c.   Y  
  d.   22nd  
  Hint    
      
  10.What process do prospective parents go through when they want to be sure any future child will be free of genetic defects?  
  a.   genetic counseling  
  b.   genetic engineering  
  c.   gene therapy  
  d.   marriage counseling  
  Hint    

 
   
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