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Chapter 11: Human Genetics

Practice Test
  1.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   heterozygote superiority  
  c.   homozygote inferiority  
  d.   color blindness  
  2.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   22nd  
  b.   X  
  c.   Y  
  d.   21st  
  3.What body systems does the disease cystic fibrosis affect?  
  a.   the endocrine and digestive systems  
  b.   the respiratory and digestive systems  
  c.   the circulatory and respiratory systems  
  d.   the circulatory and endocrine systems  
  4.What two kinds of ions are involved in cystic fibrosis?  
  a.   sodium and sulfur ions  
  b.   iron and hydrogen ions  
  c.   sodium and chloride ions  
  d.   chloride and iron ions  
  5.Which of these disorders can NOT be identified through amniocentesis?  
  a.   Down syndrome  
  b.   sickle-cell anemia  
  c.   hemophilia  
  d.   Tay-Sachs  
  6.What is the disease in which blood does not clot normally?  
  a.   hemophilia  
  b.   cystic fibrosis  
  c.   sickle-cell anemia  
  d.   Huntington's disease  
  7.What body system does Huntington's disease affect?  
  a.   the nervous system  
  b.   the respiratory system  
  c.   the circulatory system  
  d.   the digestive system  
  8.The presence of three of one kind of chromosome is known as _________ .  
  a.   trisomy  
  b.   hemophilia  
  c.   karyotyping  
  d.   translocation  
  9.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   cystic fibrosis  
  b.   red-green color blindness  
  c.   sickle-cell anemia  
  d.   hemophilia  
  10.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   fetoscopy  
  b.   chorionic villus biopsy  
  c.   gene therapy  
  d.   amniocentesis  

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