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Chapter 11: Human Genetics

Practice Test
  1.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   red-green color blindness  
  b.   cystic fibrosis  
  c.   hemophilia  
  d.   sickle-cell anemia  
  2.What is the process in which fluid surrounding the fetus is withdrawn to check for genetic disorders before a baby is born?  
  a.   genetic counseling  
  b.   chorionc villus biopsy  
  c.   amniocentesis  
  d.   ultrasonography  
  3.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.   hemophilia  
  b.   influenza  
  c.   malaria  
  d.   color blindness  
  4.What is the most commonly inherited disease among black people?  
  a.   sickle-cell anemia  
  b.   cystic fibrosis  
  c.   hemophilia  
  d.   Huntington's disease  
  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.Which of these diseases is caused by a dominant gene?  
  a.   cystic fibrosis  
  b.   hemophilia  
  c.   Huntington's disease  
  d.   sickle-cell anemia  
  7.Which of these human disorders is the result of trisomy?  
  a.   red-green color blindness  
  b.   Huntington's disease  
  c.   hemophilia  
  d.   Down syndrome  
  8.What body systems does the disease cystic fibrosis affect?  
  a.   the endocrine and digestive systems  
  b.   the circulatory and respiratory systems  
  c.   the circulatory and endocrine systems  
  d.   the respiratory and digestive systems  
  9.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   fetoscopy  
  b.   amniocentesis  
  c.   chorionic villus biopsy  
  d.   gene therapy  
  10.The presence of three of one kind of chromosome is known as _________ .  
  a.   karyotyping  
  b.   translocation  
  c.   trisomy  
  d.   hemophilia  

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