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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.   three  
  b.   one  
  c.   four  
  d.   two  
  Hint    
      
  2.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.   0%  
  b.   50%  
  c.   25%  
  d.   100%  
  Hint    
      
  3.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   color blindness  
  b.   heterozygote superiority  
  c.   homozygote inferiority  
  d.   Down syndrome  
  Hint    
      
  4.The presence of three of one kind of chromosome is known as _________ .  
  a.   hemophilia  
  b.   karyotyping  
  c.   translocation  
  d.   trisomy  
  Hint    
      
  5.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.   0%  
  b.   25%  
  c.   50%  
  d.   100%  
  Hint    
      
  6.What is the process in which fluid surrounding the fetus is withdrawn to check for genetic disorders before a baby is born?  
  a.   amniocentesis  
  b.   chorionc villus biopsy  
  c.   genetic counseling  
  d.   ultrasonography  
  Hint    
      
  7.What is the most commonly inherited disease among white people?  
  a.   cystic fibrosis  
  b.   hemophilia  
  c.   sickle-cell anemia  
  d.   Huntington's disease  
  Hint    
      
  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.   chorionic villus biopsy  
  b.   gene therapy  
  c.   genetic counseling  
  d.   amniocentesis  
  Hint    
      
  9.Cystic fibrosis is inherited when a child receives a recessive allele from each parent. What is the probability that parents who are both heterozygous for cystic fibrosis will have a child with this disease?  
  a.   25%  
  b.   50%  
  c.   75%  
  d.   100%  
  Hint    
      
  10.Which of these is NOT a normal treatment for people with sickle-cell anemia?  
  a.   physical therapy  
  b.   drugs that increase oxygen-carrying capacity of blood cells  
  c.   antibiotics  
  d.   blood transfusions  
  Hint    

 
   
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