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Chapter 11: Human Genetics

Practice Test
  1.What body systems does the disease cystic fibrosis affect?  
  a.   the respiratory and digestive systems  
  b.   the endocrine and digestive systems  
  c.   the circulatory and endocrine systems  
  d.   the circulatory and respiratory systems  
  2.Which of these disorders can NOT be identified through amniocentesis?  
  a.   sickle-cell anemia  
  b.   Down syndrome  
  c.   Tay-Sachs  
  d.   hemophilia  
  3.What is the process in which fluid surrounding the fetus is withdrawn to check for genetic disorders before a baby is born?  
  a.   ultrasonography  
  b.   genetic counseling  
  c.   chorionc villus biopsy  
  d.   amniocentesis  
  4.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.   50%  
  b.   25%  
  c.   0%  
  d.   100%  
  5.The presence of three of one kind of chromosome is known as _________ .  
  a.   translocation  
  b.   karyotyping  
  c.   trisomy  
  d.   hemophilia  
  6.What body system does Huntington's disease affect?  
  a.   the circulatory system  
  b.   the nervous system  
  c.   the respiratory system  
  d.   the digestive system  
  7.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   three  
  b.   two  
  c.   four  
  d.   one  
  8.A person who is heterozygous for sickle-cell anemia has a condition known as sickle-cell trait. What disease does sickle-cell trait protect a person against?  
  a.   color blindness  
  b.   malaria  
  c.   influenza  
  d.   hemophilia  
  9.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  
  10.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   homozygote inferiority  
  b.   Down syndrome  
  c.   color blindness  
  d.   heterozygote superiority  

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