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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.   homozygote inferiority  
  b.   color blindness  
  c.   Down syndrome  
  d.   heterozygote superiority  
  2.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.   gene therapy  
  b.   chorionic villus biopsy  
  c.   genetic counseling  
  d.   amniocentesis  
  3.Which of these disorders can NOT be identified through amniocentesis?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   Down syndrome  
  d.   Tay-Sachs  
  4.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   one  
  b.   two  
  c.   three  
  d.   four  
  5.Which of these human disorders is the result of trisomy?  
  a.   red-green color blindness  
  b.   Down syndrome  
  c.   Huntington's disease  
  d.   hemophilia  
  6.What body system does Huntington's disease affect?  
  a.   the circulatory system  
  b.   the respiratory system  
  c.   the digestive system  
  d.   the nervous system  
  7.What body systems does the disease cystic fibrosis affect?  
  a.   the respiratory and digestive systems  
  b.   the circulatory and endocrine systems  
  c.   the circulatory and respiratory systems  
  d.   the endocrine and digestive systems  
  8.What is the most commonly inherited disease among white people?  
  a.   Huntington's disease  
  b.   hemophilia  
  c.   cystic fibrosis  
  d.   sickle-cell anemia  
  9.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.   genetic counseling  
  d.   marriage counseling  
  10.The presence of three of one kind of chromosome is known as _________ .  
  a.   trisomy  
  b.   hemophilia  
  c.   translocation  
  d.   karyotyping  

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