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Chapter 11: Human Genetics

Practice Test
  1.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.   25%  
  c.   100%  
  d.   50%  
  2.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   heterozygote superiority  
  b.   color blindness  
  c.   homozygote inferiority  
  d.   Down syndrome  
  3.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   hemophilia  
  b.   red-green color blindness  
  c.   sickle-cell anemia  
  d.   cystic fibrosis  
  4.What body system does Huntington's disease affect?  
  a.   the digestive system  
  b.   the respiratory system  
  c.   the circulatory system  
  d.   the nervous system  
  5.What body systems does the disease cystic fibrosis affect?  
  a.   the circulatory and respiratory systems  
  b.   the endocrine and digestive systems  
  c.   the respiratory and digestive systems  
  d.   the circulatory and endocrine systems  
  6.Which of these human disorders is the result of trisomy?  
  a.   Huntington's disease  
  b.   hemophilia  
  c.   red-green color blindness  
  d.   Down syndrome  
  7.Which of these diseases is caused by a dominant gene?  
  a.   Huntington's disease  
  b.   cystic fibrosis  
  c.   hemophilia  
  d.   sickle-cell anemia  
  8.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   fetoscopy  
  b.   ultrasonography  
  c.   gene therapy  
  d.   genetic counseling  
  9.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   chorionic villus biopsy  
  b.   fetoscopy  
  c.   amniocentesis  
  d.   gene therapy  
  10.What is the disease in which blood does not clot normally?  
  a.   Huntington's disease  
  b.   hemophilia  
  c.   cystic fibrosis  
  d.   sickle-cell anemia  

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