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Chapter 11: Human Genetics

Practice Test
      
  1.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   21st  
  b.   22nd  
  c.   Y  
  d.   X  
  Hint    
      
  2.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.   25%  
  b.   50%  
  c.   0%  
  d.   100%  
  Hint    
      
  3.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   gene therapy  
  b.   fetoscopy  
  c.   amniocentesis  
  d.   chorionic villus biopsy  
  Hint    
      
  4.The presence of three of one kind of chromosome is known as _________ .  
  a.   translocation  
  b.   trisomy  
  c.   karyotyping  
  d.   hemophilia  
  Hint    
      
  5.What is a picture of human chromosomes?  
  a.   karyotype  
  b.   chorionic biopsy  
  c.   ultrasound  
  d.   fetoscope  
  Hint    
      
  6.Which of these human disorders is the result of trisomy?  
  a.   hemophilia  
  b.   Down syndrome  
  c.   Huntington's disease  
  d.   red-green color blindness  
  Hint    
      
  7.What body system does Huntington's disease affect?  
  a.   the circulatory system  
  b.   the respiratory system  
  c.   the nervous system  
  d.   the digestive system  
  Hint    
      
  8.What is the disease in which blood does not clot normally?  
  a.   Huntington's disease  
  b.   cystic fibrosis  
  c.   sickle-cell anemia  
  d.   hemophilia  
  Hint    
      
  9.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   two  
  b.   three  
  c.   four  
  d.   one  
  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.   25%  
  c.   50%  
  d.   100%  
  Hint    

 
   
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