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Chapter 11: Human Genetics

Practice Test
      
  1.What two kinds of ions are involved in cystic fibrosis?  
  a.   chloride and iron ions  
  b.   iron and hydrogen ions  
  c.   sodium and chloride ions  
  d.   sodium and sulfur ions  
  Hint    
      
  2.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 engineering  
  d.   genetic counseling  
  Hint    
      
  3.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   chorionic villus biopsy  
  b.   gene therapy  
  c.   amniocentesis  
  d.   fetoscopy  
  Hint    
      
  4.What is the process in which fluid surrounding the fetus is withdrawn to check for genetic disorders before a baby is born?  
  a.   amniocentesis  
  b.   ultrasonography  
  c.   chorionc villus biopsy  
  d.   genetic counseling  
  Hint    
      
  5.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.   25%  
  c.   50%  
  d.   100%  
  Hint    
      
  6.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.   100%  
  c.   50%  
  d.   25%  
  Hint    
      
  7.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   X  
  b.   22nd  
  c.   Y  
  d.   21st  
  Hint    
      
  8.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   cystic fibrosis  
  b.   hemophilia  
  c.   sickle-cell anemia  
  d.   red-green color blindness  
  Hint    
      
  9.Which of these diseases is caused by a dominant gene?  
  a.   hemophilia  
  b.   Huntington's disease  
  c.   sickle-cell anemia  
  d.   cystic fibrosis  
  Hint    
      
  10.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.   50%  
  c.   25%  
  d.   100%  
  Hint    

 
   
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