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Chapter 11: Human Genetics

Practice Test
  1.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   two  
  b.   three  
  c.   four  
  d.   one  
  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.   influenza  
  c.   hemophilia  
  d.   malaria  
  3.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   genetic counseling  
  b.   gene therapy  
  c.   fetoscopy  
  d.   ultrasonography  
  4.What is a picture of human chromosomes?  
  a.   chorionic biopsy  
  b.   ultrasound  
  c.   karyotype  
  d.   fetoscope  
  5.What body systems does the disease cystic fibrosis affect?  
  a.   the endocrine and digestive systems  
  b.   the respiratory and digestive systems  
  c.   the circulatory and respiratory systems  
  d.   the circulatory and endocrine systems  
  6.What two kinds of ions are involved in cystic fibrosis?  
  a.   chloride and iron ions  
  b.   sodium and chloride ions  
  c.   iron and hydrogen ions  
  d.   sodium and sulfur ions  
  7.What is the most commonly inherited disease among black people?  
  a.   hemophilia  
  b.   sickle-cell anemia  
  c.   cystic fibrosis  
  d.   Huntington's disease  
  8.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   gene therapy  
  b.   chorionic villus biopsy  
  c.   amniocentesis  
  d.   fetoscopy  
  9.Which of these diseases is caused by a dominant gene?  
  a.   hemophilia  
  b.   cystic fibrosis  
  c.   Huntington's disease  
  d.   sickle-cell anemia  
  10.Which of these is NOT a normal treatment for people with sickle-cell anemia?  
  a.   physical therapy  
  b.   antibiotics  
  c.   drugs that increase oxygen-carrying capacity of blood cells  
  d.   blood transfusions  

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