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Chapter 11: Human Genetics

Practice Test
      
  1.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   22nd  
  b.   Y  
  c.   X  
  d.   21st  
  Hint    
      
  2.What is the disease in which blood does not clot normally?  
  a.   hemophilia  
  b.   sickle-cell anemia  
  c.   cystic fibrosis  
  d.   Huntington's disease  
  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.   0%  
  b.   25%  
  c.   100%  
  d.   50%  
  Hint    
      
  4.Which of these diseases is caused by a dominant gene?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   cystic fibrosis  
  d.   Huntington's disease  
  Hint    
      
  5.What process do prospective parents go through when they want to be sure any future child will be free of genetic defects?  
  a.   genetic engineering  
  b.   gene therapy  
  c.   marriage counseling  
  d.   genetic counseling  
  Hint    
      
  6.The presence of three of one kind of chromosome is known as _________ .  
  a.   translocation  
  b.   hemophilia  
  c.   karyotyping  
  d.   trisomy  
  Hint    
      
  7.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.   gene therapy  
  c.   chorionic villus biopsy  
  d.   genetic counseling  
  Hint    
      
  8.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   one  
  b.   four  
  c.   three  
  d.   two  
  Hint    
      
  9.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.   100%  
  b.   50%  
  c.   25%  
  d.   0%  
  Hint    
      
  10.Which of these disorders can NOT be identified through amniocentesis?  
  a.   hemophilia  
  b.   sickle-cell anemia  
  c.   Down syndrome  
  d.   Tay-Sachs  
  Hint    

 
   
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