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Chapter 11: Human Genetics

Practice Test
      
  1.What body systems does the disease cystic fibrosis affect?  
  a.   the circulatory and respiratory systems  
  b.   the circulatory and endocrine systems  
  c.   the respiratory and digestive systems  
  d.   the endocrine and digestive systems  
  Hint    
      
  2.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    
      
  3.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  
  Hint    
      
  4.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  
  Hint    
      
  5.What process do prospective parents go through when they want to be sure any future child will be free of genetic defects?  
  a.   genetic engineering  
  b.   gene therapy  
  c.   marriage counseling  
  d.   genetic counseling  
  Hint    
      
  6.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.   50%  
  c.   25%  
  d.   100%  
  Hint    
      
  7.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   heterozygote superiority  
  c.   color blindness  
  d.   homozygote inferiority  
  Hint    
      
  8.What is a picture of human chromosomes?  
  a.   fetoscope  
  b.   chorionic biopsy  
  c.   ultrasound  
  d.   karyotype  
  Hint    
      
  9.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   gene therapy  
  b.   fetoscopy  
  c.   chorionic villus biopsy  
  d.   amniocentesis  
  Hint    
      
  10.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.   50%  
  c.   25%  
  d.   0%  
  Hint    

 
   
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