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Chapter 11: Human Genetics

Practice Test
  1.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   21st  
  b.   X  
  c.   22nd  
  d.   Y  
  2.Which of these disorders can NOT be identified through amniocentesis?  
  a.   Tay-Sachs  
  b.   hemophilia  
  c.   sickle-cell anemia  
  d.   Down syndrome  
  3.Which of these diseases is caused by a dominant gene?  
  a.   hemophilia  
  b.   sickle-cell anemia  
  c.   cystic fibrosis  
  d.   Huntington's disease  
  4.The presence of three of one kind of chromosome is known as _________ .  
  a.   translocation  
  b.   karyotyping  
  c.   hemophilia  
  d.   trisomy  
  5.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   cystic fibrosis  
  d.   red-green color blindness  
  6.What body system does Huntington's disease affect?  
  a.   the digestive system  
  b.   the circulatory system  
  c.   the respiratory system  
  d.   the nervous system  
  7.What two kinds of ions are involved in cystic fibrosis?  
  a.   iron and hydrogen ions  
  b.   sodium and sulfur ions  
  c.   chloride and iron ions  
  d.   sodium and chloride ions  
  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.   hemophilia  
  c.   malaria  
  d.   influenza  
  9.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 daughter who has hemophilia?  
  a.   50%  
  b.   25%  
  c.   0%  
  d.   100%  
  10.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.   chorionic villus biopsy  
  b.   genetic counseling  
  c.   amniocentesis  
  d.   gene therapy  

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