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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.   sickle-cell anemia  
  c.   cystic fibrosis  
  d.   hemophilia  
  2.The presence of three of one kind of chromosome is known as _________ .  
  a.   karyotyping  
  b.   translocation  
  c.   hemophilia  
  d.   trisomy  
  3.Which of these disorders can NOT be identified through amniocentesis?  
  a.   Down syndrome  
  b.   sickle-cell anemia  
  c.   Tay-Sachs  
  d.   hemophilia  
  4.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   heterozygote superiority  
  b.   homozygote inferiority  
  c.   color blindness  
  d.   Down syndrome  
  5.What is the most commonly inherited disease among white people?  
  a.   Huntington's disease  
  b.   cystic fibrosis  
  c.   hemophilia  
  d.   sickle-cell anemia  
  6.What is the disease in which blood does not clot normally?  
  a.   sickle-cell anemia  
  b.   Huntington's disease  
  c.   hemophilia  
  d.   cystic fibrosis  
  7.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.   25%  
  b.   100%  
  c.   0%  
  d.   50%  
  8.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.   genetic counseling  
  c.   amniocentesis  
  d.   chorionic villus biopsy  
  9.What two kinds of ions are involved in cystic fibrosis?  
  a.   sodium and chloride ions  
  b.   chloride and iron ions  
  c.   sodium and sulfur ions  
  d.   iron and hydrogen ions  
  10.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.   influenza  
  b.   color blindness  
  c.   malaria  
  d.   hemophilia  

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