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Chapter 11: Human Genetics

Practice Test
  1.Which of these human disorders is the result of trisomy?  
  a.   Down syndrome  
  b.   hemophilia  
  c.   red-green color blindness  
  d.   Huntington's disease  
  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.   0%  
  b.   100%  
  c.   25%  
  d.   50%  
  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  
  4.Which of these diseases is caused by a dominant gene?  
  a.   sickle-cell anemia  
  b.   cystic fibrosis  
  c.   Huntington's disease  
  d.   hemophilia  
  5.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.   genetic counseling  
  c.   gene therapy  
  d.   genetic engineering  
  6.What body system does Huntington's disease affect?  
  a.   the nervous system  
  b.   the circulatory system  
  c.   the respiratory system  
  d.   the digestive system  
  7.The presence of three of one kind of chromosome is known as _________ .  
  a.   translocation  
  b.   karyotyping  
  c.   hemophilia  
  d.   trisomy  
  8.What is the most commonly inherited disease among white people?  
  a.   cystic fibrosis  
  b.   Huntington's disease  
  c.   sickle-cell anemia  
  d.   hemophilia  
  9.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   21st  
  b.   22nd  
  c.   Y  
  d.   X  
  10.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   fetoscopy  
  b.   genetic counseling  
  c.   gene therapy  
  d.   ultrasonography  

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