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Chapter 11: Human Genetics

Practice Test
  1.The presence of three of one kind of chromosome is known as _________ .  
  a.   karyotyping  
  b.   hemophilia  
  c.   trisomy  
  d.   translocation  
  2.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  
  3.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  
  4.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   fetoscopy  
  b.   gene therapy  
  c.   chorionic villus biopsy  
  d.   amniocentesis  
  5.What body system does Huntington's disease affect?  
  a.   the respiratory system  
  b.   the circulatory system  
  c.   the digestive system  
  d.   the nervous system  
  6.What is a picture of human chromosomes?  
  a.   fetoscope  
  b.   chorionic biopsy  
  c.   ultrasound  
  d.   karyotype  
  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.   100%  
  b.   0%  
  c.   50%  
  d.   25%  
  8.Which of these diseases is caused by a dominant gene?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   cystic fibrosis  
  d.   Huntington's disease  
  9.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   X  
  b.   22nd  
  c.   Y  
  d.   21st  
  10.What is the most commonly inherited disease among black people?  
  a.   hemophilia  
  b.   sickle-cell anemia  
  c.   Huntington's disease  
  d.   cystic fibrosis  

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